Check-Host.cc

Domain

activity.office.com

Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.

Run a live full scan of activity.office.com

On-demand: ports, banners, TLS, tech-stack, subdomains and origin/IP-leak detection. Results are shared publicly for everyone to link to.

Deep-scan now
Hosting IPs
53
A/AAAA targets
Subdomains
CT + scan + body
Record Types
2
seen in DNS
Observed Certs
118
in our scans

DNS Records

A
52.110.0.112, 52.110.0.36, 52.110.0.37, 52.110.0.53, 52.110.17.11, 52.110.17.18, 52.110.17.3, 52.110.17.34
AAAA
2603:1063:2001:220b::365:ff1, 2603:1063:2001:2212::365:ff1, 2603:1063:2001:2213::365:ff1, 2603:1063:2001:2227::365:ff1, 2603:1063:2001:2228::365:ff1, 2603:1063:2001:222d::365:ff1, 2603:1063:2001:222f::365:ff1, 2603:1063:2001:2234::365:ff1
MX
NS
TXT
CNAME
CAA

WHOIS / Registration

Registration data planned

Registrar, creation/expiry dates and domain status via RDAP. Rolling out gradually — bulk WHOIS is rate-limited, so we resolve on a prioritized cadence.

Subdomains

Subdomain enumeration pending

Every subdomain ever issued a TLS cert under this apex — extracted from Certificate Transparency logs, our own scan observations and body references.

Tech Stack

Tech detection pending

Wappalyzer-rules detect CMS, frameworks, analytics, JS libs and server-side languages on this domain.

TLS Certificates

Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: *.3pidentity.svc.cloud.microsoft, *.identity-df.osi.office.net, *.identity.osi.office.net, *.identity.osi.officeppe.net, *.idlesession.svc.cloud.microsoft, 3pidentity.svc.cloud.microsoft, activity.office.com, identity-df.osi.office.net, identity-eu.osi.office.net, identity.office.com, identity.osi.office.net, identity.osi.officeppe.net, idlesession.svc.cloud.microsoft
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: *.3pidentity.svc.cloud.microsoft, *.identity-df.osi.office.net, *.identity.osi.office.net, *.identity.osi.officeppe.net, *.idlesession.svc.cloud.microsoft, 3pidentity.svc.cloud.microsoft, activity.office.com, identity-df.osi.office.net, identity-eu.osi.office.net, identity.office.com, identity.osi.office.net, identity.osi.officeppe.net, idlesession.svc.cloud.microsoft
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: *.3pidentity.svc.cloud.microsoft, *.identity-df.osi.office.net, *.identity.osi.office.net, *.identity.osi.officeppe.net, *.idlesession.svc.cloud.microsoft, 3pidentity.svc.cloud.microsoft, activity.office.com, identity-df.osi.office.net, identity-eu.osi.office.net, identity.office.com, identity.osi.office.net, identity.osi.officeppe.net, idlesession.svc.cloud.microsoft
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: *.3pidentity.svc.cloud.microsoft, *.identity-df.osi.office.net, *.identity.osi.office.net, *.identity.osi.officeppe.net, *.idlesession.svc.cloud.microsoft, 3pidentity.svc.cloud.microsoft, activity.office.com, identity-df.osi.office.net, identity-eu.osi.office.net, identity.office.com, identity.osi.office.net, identity.osi.officeppe.net, idlesession.svc.cloud.microsoft

IPs Citing This Domain

No citing IPs found yet

As the world-sweep progresses, hosts referencing this domain in their HTML will surface here.

Origin / IP-Leak

USP

When a hostname is served behind a CDN (e.g. Cloudflare), the origin server can sometimes be identified by matching its TLS cert against the protected hostname. Findings shown here are heuristic candidates, not guarantees.

No origin-IP leaks detected (yet)

Either this domain doesn't sit behind a CDN, or we haven't seen a TLS cert from a non-CDN IP matching this hostname. Run a fullscan to refresh the cert→IP cross-reference.

CT-Log Evidence

Certificates from public Certificate Transparency logs whose subject or SAN names this domain — including historic certs we never observed live.

d04a355b0a2bcd9c… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-04-02 21:59:17 → 2026-09-29 21:59:17
5517748989466b5e… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-04-02 14:21:55 → 2026-09-29 14:21:55
7e901f75761d7abb… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, *.idlesession.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, 3pidentity.svc.cloud.microsoft
Valid: 2026-04-02 07:59:49 → 2026-09-29 07:59:49
78a118bba65d93cb… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 06:48:44 → 2026-09-25 06:48:44
853df6529d90c9df… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 05:25:45 → 2026-09-25 05:25:45
3df21d942411cc50… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 04:45:21 → 2026-09-25 04:45:21
477c499a37a6fcc9… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 01:00:52 → 2026-09-25 01:00:52
2fc648d8b05c3e0c… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 00:52:58 → 2026-09-25 00:52:58
fc1e8f002b0ce611… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-29 00:13:45 → 2026-09-25 00:13:45
643ead1851951472… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 23:36:21 → 2026-09-24 23:36:21
5a1cae0f7a0b0574… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 22:35:18 → 2026-09-24 22:35:18
88e1a11f5f45f7cf… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 02
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 21:11:17 → 2026-09-24 21:11:17
eefb2dbf30072e47… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 04
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 15:54:01 → 2026-09-24 15:54:01
2911edc6e6c6256c… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 04
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 10:51:59 → 2026-09-24 10:51:59
ea05f342b52fefac… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 04
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 08:56:03 → 2026-09-24 08:56:03
88c3efa3aa0eea5c… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 08:45:45 → 2026-09-24 08:45:45
83d1b8b44f23e26e… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 05:33:59 → 2026-09-24 05:33:59
34ae3b8e02b9125b… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 16
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-28 00:09:38 → 2026-09-24 00:09:38
42c88ee483ddf9e3… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 04
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-27 22:21:05 → 2026-09-23 22:21:05
493a1d6f6f173169… google · xenon2026h2
Subject: identity.osi.office.net
Issuer: Microsoft TLS G2 RSA CA OCSP 10
SANs: identity.osi.office.net, *.identity.osi.office.net, identity.osi.officeppe.net, *.identity.osi.officeppe.net, identity.office.com, activity.office.com, identity-df.osi.office.net, *.identity-df.osi.office.net, identity-eu.osi.office.net, 3pidentity.svc.cloud.microsoft, *.3pidentity.svc.cloud.microsoft, idlesession.svc.cloud.microsoft, *.idlesession.svc.cloud.microsoft
Valid: 2026-03-27 18:05:41 → 2026-09-23 18:05:41

Threat Intelligence

Domain threat-intel pending

Matches in URLhaus, OpenPhish, PhishTank, malware feeds, and Spamhaus DBL.

History

Passive DNS — every value this name ever resolved to and when we first / last observed it. Updates every cycle of our forward-DNS crawler.

Type Value First seen Last seen
A 52.110.17.3 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
A 52.110.17.34 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
A 52.110.17.40 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
AAAA 2603:1063:2001:2212::365:ff1 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
AAAA 2603:1063:2001:2245::365:ff1 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
A 52.110.17.44 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
AAAA 2603:1063:2001:223f::365:ff1 2026-06-19 01:53:44.361 2026-07-27 14:38:03.207
AAAA 2603:1063:2001:222d::365:ff1 2026-06-19 01:53:44.361 2026-06-19 01:53:44.361
A 52.110.18.141 2026-06-21 22:50:53.631 2026-06-21 22:50:53.631
AAAA 2603:1063:2001:2d0e::365:ff1 2026-06-21 22:50:53.631 2026-07-24 03:40:17.794
A 52.110.18.139 2026-06-21 22:50:53.631 2026-07-27 19:46:08.690
AAAA 2603:1063:2001:2d0c::365:ff1 2026-06-21 22:50:53.631 2026-07-24 03:12:47.996
AAAA 2603:1063:2001:2d0a::365:ff1 2026-06-21 22:50:53.631 2026-07-17 23:45:03.763
AAAA 2603:1063:2001:2d05::365:ff1 2026-06-21 22:50:53.631 2026-07-26 04:05:32.050
A 52.110.18.133 2026-06-21 22:50:53.631 2026-07-24 03:31:40.498
A 52.110.18.138 2026-06-21 22:50:53.631 2026-07-24 03:12:47.996
AAAA 2603:1063:2001:2d00::365:ff1 2026-07-17 23:45:03.763 2026-07-27 19:46:08.690
A 52.110.18.142 2026-07-17 23:45:03.763 2026-07-27 19:46:08.690
A 52.110.18.132 2026-07-17 23:45:03.763 2026-07-24 03:40:17.794
AAAA 2603:1063:2001:2d01::365:ff1 2026-07-17 23:45:03.763 2026-07-24 03:40:17.794
A 52.110.18.128 2026-07-17 23:45:03.763 2026-07-20 01:05:09.354
AAAA 2603:1063:2001:2d03::365:ff1 2026-07-20 01:05:09.354 2026-07-27 19:46:08.690
AAAA 2603:1063:2001:2d02::365:ff1 2026-07-20 01:05:09.354 2026-07-20 01:05:09.354
A 52.110.18.136 2026-07-20 01:05:09.354 2026-07-24 03:40:17.794
A 52.110.18.140 2026-07-20 01:05:09.354 2026-07-24 03:40:17.794
A 52.110.18.130 2026-07-24 03:12:47.996 2026-07-27 19:46:08.690
AAAA 2603:1063:2001:2d04::365:ff1 2026-07-24 03:12:47.996 2026-07-27 19:46:08.690
AAAA 2603:1063:2001:2d0d::365:ff1 2026-07-24 03:12:47.996 2026-07-24 03:40:17.794
AAAA 2603:1063:2001:223b::365:ff1 2026-07-24 03:31:40.498 2026-07-24 03:31:40.498
AAAA 2603:1063:2001:223d::365:ff1 2026-07-24 03:31:40.498 2026-07-24 03:31:40.498
AAAA 2603:1063:2001:220b::365:ff1 2026-07-24 03:31:40.498 2026-07-24 03:31:40.498
A 52.110.18.131 2026-07-24 03:31:40.498 2026-07-27 19:46:08.690
AAAA 2603:1063:2001:2249::365:ff1 2026-07-24 03:31:40.498 2026-07-24 03:31:40.498
A 52.110.0.37 2026-07-26 04:05:32.050 2026-07-26 04:05:32.050
A 52.110.0.112 2026-07-26 04:05:32.050 2026-07-26 04:05:32.050
AAAA 2603:1063:2001:2d0b::365:ff1 2026-07-26 04:05:32.050 2026-07-26 04:05:32.050
A 52.110.0.36 2026-07-26 04:05:32.050 2026-07-26 04:05:32.050
A 52.110.0.53 2026-07-26 04:05:32.050 2026-07-26 04:05:32.050
A 52.110.17.46 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
A 52.110.17.11 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
AAAA 2603:1063:2001:2234::365:ff1 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
AAAA 2603:1063:2001:2213::365:ff1 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
A 52.110.17.18 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
A 52.110.17.47 2026-07-26 04:14:37.123 2026-07-27 14:38:03.207
AAAA 2603:1063:2001:2235::365:ff1 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
AAAA 2603:1063:2001:2228::365:ff1 2026-07-26 04:14:37.123 2026-07-26 04:14:37.123
AAAA 2603:1063:2001:2247::365:ff1 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
AAAA 2603:1063:2001:2227::365:ff1 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
A 52.110.17.61 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
A 52.110.17.63 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
A 52.110.17.59 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
AAAA 2603:1063:2001:222f::365:ff1 2026-07-27 14:38:03.207 2026-07-27 14:38:03.207
AAAA 2603:1063:2001:2d08::365:ff1 2026-07-27 19:46:08.690 2026-07-27 19:46:08.690