Check-Host.cc

Domain

piazza.com

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

Run a live full scan of piazza.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
17
A/AAAA targets
Subdomains
50
CT + scan + body
Record Types
5
seen in DNS
Observed Certs
5
in our scans

DNS Records

A
100.48.183.57, 100.50.220.201, 100.52.59.187, 100.59.112.30, 107.20.177.212, 18.205.146.192, 18.208.122.119, 18.213.191.46
AAAA
MX
10 piazza-com.mail.protection.outlook.com
NS
ns-1360.awsdns-42.org, ns-1868.awsdns-41.co.uk, ns-74.awsdns-09.com, ns-987.awsdns-59.net
TXT
apple-domain-verification=NvgAGTreJ9br6TT3, google-site-verification=vP_7vShksrvqA6VobTihMByOMO-jlUzs59fLoyKIrQU, v=spf1 a mx include:u5126.wl127.sendgrid.net include:spf.protection.outlook.com include:amazonses.com -all
CNAME
CAA
0 issue "amazonaws.com", 0 issue "digicert.com", 0 issue "godaddy.com", 0 issue "letsencrypt.org", 0 issuewild "godaddy.com"

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

Every subdomain we know about — harvested from CT-log SANs, scan-observed certs and HTML body references — paired with its current A/AAAA target.

Subdomain Resolves to Last seen
piazza.com 2026-07-27 00:37:56.931
checkin.piazza.com 2026-07-16 05:19:42.639
push.piazza.com 2026-07-16 05:19:42.639
recruiting.piazza.com 2026-07-16 05:19:42.639
talent.piazza.com 2026-07-16 05:19:42.639
www.piazza.com 2026-07-16 05:19:42.639
earlyaccess.piazza.com 2026-07-16 05:19:42.639
cdn-private.piazza.com
1970-01-01 00:00:00.000
cdn-test-private.piazza.com
1970-01-01 00:00:00.000
cdn-test-uploads.piazza.com
1970-01-01 00:00:00.000
cdn-uploads.piazza.com
1970-01-01 00:00:00.000
credentials.piazza.com
1970-01-01 00:00:00.000
development.cd.piazza.com
1970-01-01 00:00:00.000
nonproduction-credentials.piazza.com
1970-01-01 00:00:00.000
old.test.piazza.com
1970-01-01 00:00:00.000
prod-access.piazza.com
1970-01-01 00:00:00.000
prod-task.piazza.com
1970-01-01 00:00:00.000
production.cd.piazza.com
1970-01-01 00:00:00.000
test-cdn.piazza.com
1970-01-01 00:00:00.000
test-credentials.piazza.com
1970-01-01 00:00:00.000
test-push.piazza.com
1970-01-01 00:00:00.000
test-talent.piazza.com
1970-01-01 00:00:00.000
test.piazza.com
1970-01-01 00:00:00.000

Tech Stack

Tech detection pending

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

TLS Certificates

Subject: ecs.studio-piazza.com
Issuer: YR1
SANs: ecs.studio-piazza.com
Subject: piazza.com
Issuer: Amazon RSA 2048 M04
SANs: checkin.piazza.com, earlyaccess.piazza.com, piazza.com, prod-access.piazza.com, prod-task.piazza.com, push.piazza.com, recruiting.piazza.com, talent.piazza.com, www.piazza.com
Subject: piazza.com
Issuer: Amazon RSA 2048 M04
SANs: checkin.piazza.com, earlyaccess.piazza.com, piazza.com, prod-access.piazza.com, prod-task.piazza.com, push.piazza.com, recruiting.piazza.com, talent.piazza.com, www.piazza.com

IPs Citing This Domain

Hosts whose HTML body references this domain. Strong signal for origin/mirror/embed discovery.

143.42.122.49:443 href · ×4
64.90.53.59:80 href · ×3
131.246.117.32:80 href · ×2
159.89.179.140:443 href · ×2
208.87.225.232:80 href · ×1

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.

a36567a3c45cb2cd… google · xenon2026h2
Subject: piazza.com
Issuer: Amazon RSA 2048 M04
SANs: piazza.com, talent.piazza.com, push.piazza.com, recruiting.piazza.com, www.piazza.com, checkin.piazza.com, prod-access.piazza.com, earlyaccess.piazza.com, prod-task.piazza.com
Valid: 2026-03-17 00:00:00 → 2026-09-30 23:59:59
dce00b0b92688e7e… google · xenon2026h2
Subject: piazza.com
Issuer: Amazon RSA 2048 M04
SANs: piazza.com, talent.piazza.com, push.piazza.com, recruiting.piazza.com, www.piazza.com, checkin.piazza.com, prod-access.piazza.com, earlyaccess.piazza.com, prod-task.piazza.com
Valid: 2026-03-17 00:00:00 → 2026-09-30 23:59:59
dfdbf5bb296581b3… digicert · wyvern2026h2
Subject: piazza.com
Issuer: Amazon RSA 2048 M02
SANs: piazza.com, talent.piazza.com, push.piazza.com, recruiting.piazza.com, www.piazza.com, checkin.piazza.com, prod-access.piazza.com, prod-task.piazza.com
Valid: 2025-07-10 00:00:00 → 2026-08-08 23:59:59

Threat Intelligence

Domain threat-intel pending

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

History

Domain timeline pending

Passive-DNS history accumulates as our forward-DNS crawler observes A/AAAA/MX/NS/TXT records over time.