Check-Host.cc

Domain

a16z.com

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

Run a live full scan of a16z.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
29
A/AAAA targets
Subdomains
39
CT + scan + body
Record Types
5
seen in DNS
Observed Certs
6
in our scans

DNS Records

A
75.2.60.5
AAAA
MX
10 aspmx.l.google.com, 20 alt1.aspmx.l.google.com, 30 alt2.aspmx.l.google.com, 40 aspmx2.googlemail.com, 50 aspmx3.googlemail.com
NS
ha1.markmonitor.zone, ha2.markmonitor.zone, ha3.markmonitor.zone, ha4.markmonitor.zone
TXT
1password-site-verification=YNM3U5T3JZG5PEII74IIUKCOLQ, MS=297F6982EA6FC1794C4BC3FB5FF63A8E4CD4FAC4, MS=ms78121488, TAILSCALE-hgqvPubwp5HFczvxm0V3, ZOOM_verify_CZpP8WiXT3CuvCsqJO99fQ, a5ml0q2qredqkscjd0cnd3rs5o, affinity-allowed-subdomains=a16z,a16z-crypto, anthropic-domain-verification-afe4hb=TrYvFm4pI5i7OwaiQnLdjFmZi
CNAME
CAA
0 issue "amazon.com", 0 issue "digicert.com", 0 issue "godaddy.com", 0 issue "letsencrypt.org", 0 issue "pki.goog"

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

Certificate observations pending

TLS certs naming this domain in subject or SANs will appear here as our scan-layer catches them.

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.

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
MX 40 aspmx2.googlemail.com 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT elevenlabs=27i8sF6BnzYwPsZ5yq5TdjVJ000nf-OvqH4jBvfEnAQ 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
NS ha4.markmonitor.zone 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT anthropic-domain-verification-afe4hb=TrYvFm4pI5i7OwaiQnLdjFmZi 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT MS=297F6982EA6FC1794C4BC3FB5FF63A8E4CD4FAC4 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
MX 20 alt1.aspmx.l.google.com 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT stripe-verification=FC0027ACED84DA245559E90AA0BE435C9D507EE24C5CF17AFD11316B98087577 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT perplexity-ai-domain-verification-66m0r7=3MZMPYJPZOdMXMDKTQAozQpXs 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT v=spf1 include:_spf.google.com include:_spf.salesforce.com include:spf.happyfox.com include:mktomail.com include:sendgrid.net ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:199.15.214.45/32 ip4:199.15.214.46/32 ip4:199.15.214.47/32 ip4:199.15.214.48/32 ip4:199.15.214.49/32 ip4:199.15.214.50/32 ip4:199.15.214.199/32 ip4:199.15.214.201/32 ip4:199.15.214.202/32 ip4:199.15.215.77/32 ip4:199.15.215.78/32 ip4:199.15.215.79/32 ip4:199.15.215.80/32 ip4:199.15.215.81/32 ip4:199.15.215.82/32 ip4:192.254.121.248/32 ip4:148.105.12.0/24 ip4:167.89.98.146/32 ip4:167.89.89.46/32 ip4:54.149.36.89/32 ip4:44.236.219.44/32 -all 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT wiz-domain-verification=5dc014a9a7637634bf88686260016ef95998390f9f1703e28716979f451f9a73 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT gamma-domain-verification-gp4vsa=J4Meie8RekYZa4fxKQ5kuayqy 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT notion_verify_FvVFn84Y5fBnAntNFUjAg1p8Mox5n8sVJtGGVpmMeKV3PNqhbTdF1MsP5gWvM08GZqFDAZ 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
CAA 0 issue "letsencrypt.org" 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT a5ml0q2qredqkscjd0cnd3rs5o 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT h1-domain-verification=vkosaeLv5aMSu6gt7GRxtajukLQ3hKGixbfbe9ZWR8VwKYf9 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT hubspot-domain-verification=MWVlYzc1MzAtMzY4MC00MzNkLTk0NGQtOWU2Y2I3MTJiZDI2 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT ZOOM_verify_CZpP8WiXT3CuvCsqJO99fQ 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
NS ha2.markmonitor.zone 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT google-site-verification=Cda284zEu8xh5veDdCm00SdfO_tJF-ebT809nkgB1zA 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT domain-verification=1bfe2ca1d5037d223770e532e8422f430ab27da4347b03cf1c29122512653205 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT jamf-site-verification=r5S6YMFCZk83AroC1PcG8w 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
MX 30 alt2.aspmx.l.google.com 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT mixpanel-domain-verify=b42dbd80-4f32-4eb4-ad76-2e0c938506f7 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
CAA 0 issue "amazon.com" 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT serval-domain-verification-nadw7s=JIQXhfD5M5kFQCtvXTVU0q9Zu 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT TAILSCALE-hgqvPubwp5HFczvxm0V3 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT zapier-domain-verification-challenge=f9cf9944-aaa7-4e2b-aabf-d2a392c18e0c 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
MX 10 aspmx.l.google.com 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT cursor-domain-verification-7pnt8f=k0kHfixkiuNQWkL4COkqeKER8 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT censys-domain-verification=J1TG-Io7I9BckAxCWrurh86BYAQZGVEmTynNV9awatzH 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
A 75.2.60.5 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
NS ha1.markmonitor.zone 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT atlassian-domain-verification=afgyuWvgwYP6dShfPqgKfpNFXkbap4546WDp6lt8DCGR1IykT5K03ZapUqnP0rp5 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT ccisso=ccd758c0-2760-47f8-a10d-e5fc116fddae 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT openai-domain-verification=dv-CeeBac0VpbCCPpKaEHijwN7V 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT MS=ms78121488 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
CAA 0 issue "godaddy.com" 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
CAA 0 issue "pki.goog" 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
NS ha3.markmonitor.zone 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT 1password-site-verification=YNM3U5T3JZG5PEII74IIUKCOLQ 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
MX 50 aspmx3.googlemail.com 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT mgverify=0fe09ec683f6868bb8547d3edcd914093dd94e3957094a60fe4f5e496b2b9745 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT affinity-allowed-subdomains=a16z,a16z-crypto 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT neat-pulse-domain-verification-4wMj96X=d2d2ebff-e37e-4bac-9efc-a5b0e583a0d4 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
CAA 0 issue "digicert.com" 2026-05-25 22:44:53.378 2026-07-24 13:56:53.925
TXT parsec-domain-verification=td_3ArojZEiT7u4XxzU4tNRo3dw1iF 2026-05-31 18:44:51.117 2026-07-24 13:56:53.925
TXT linear-domain-verification=ka59g9ke4vnh 2026-07-24 13:56:53.925 2026-07-24 13:56:53.925