How is posthog.com?

Looks fine risk 0/100

Registered 7 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 88 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

88 ms

HTTPS

40 d

left on a Let's Encrypt certificate

Age

7 years

registered 2020-01-23

Blocklists

listings across 5 lists

Everything we looked at

DNS records4 record types

A	216.150.1.1
MX	5 alt2.aspmx.l.google.com 1 aspmx.l.google.com 10 alt3.aspmx.l.google.com 10 alt4.aspmx.l.google.com 5 alt1.aspmx.l.google.com
NS	julissa.ns.cloudflare.com rory.ns.cloudflare.com
TXT	google-site-verification=rV-p0xIuoSPKEOsbXiFRdpuRNAIvkmvqUCMKQdQNiQQ google-site-verification=y_lIMB59lFcZyw-aDkPwQH04ErnkAuswbPDI48kj7NU hubspot-developer-verification=MjAwNTY0MDEtNjg3Zi00ZDYyLWEwMmEtOWRlY2M4NGMwMWEx hubspot-developer-verification=NmM3ZGZjOGItMTFkNC00Y2JlLTk2OGMtNWI5NGRlNWE2MTk1 hubspot-developer-verification=ZjBiZGU4ZWEtMmQzNS00YTIzLTg1NzktOWFhYmZhZWYyNGRj openai-domain-verification=dv-neQHJF2tLgKhhJ9cppTLIyQX sinch-domain-verification=3b91dbc6-6227-41f1-8251-f208d684cb4b slack-domain-verification=pJ3bCWRyJrqVBSqaEFOoL5beWxNfWUAdsHqCv7bq stripe-verification=0758FA8B9CFF58AD6C7CA769A4CBCD1F538FD3CAE856ED865B600E0C85F8AF9C tiktok-developers-site-verification=lhlLSOG6nN8VhySQd9N00K8kezUO085W v=spf1 include:_spf.google.com include:mail.zendesk.com include:servers.mcsv.net include:spf.mandrillapp.com include:amazonses.com include:mailgun.org -all warpstream-verification=W8ZSnRMODyyK7db-HsqH0g== wiz-domain-verification=3357378f04c747f632241dede60682807fdd2f1cbf17eaad4433626cadba1d34 xmpYvq0qq2jlJ41DdaHeshLvvw zapier-domain-verification-challenge=2d19d8f3-abea-4e65-9d76-afc2cfabbea2 MS=ms19564166 anthropic-domain-verification-fk0e2j=R5tx8jvOBLON93kYQoe7azTT5 apple-domain-verification=LVLu2hGeleHVVEIh cloudflare_dashboard_sso=bf5bb621cae6f03b04deaeb95a4fbb47 google-site-verification=2aAHS6wwKXEihn7xmDkURVERdCE1Ud1oDL257IR1JEY google-site-verification=8iSexCUhAjrq9sdND8snbBMQkxgT1uPyuLn8qMKCC3g google-site-verification=HlrzEAPHS7VRZcGfvU39mhF86LLDPz-Nm88y6vEHSUk google-site-verification=JnVdTQN5QXDDrPw09cSFIRwc_hkmVQgwgpyuEUe3qgg google-site-verification=OzoiNToqd-3naAZ8v66RAlu4GFLD83oLYTAFuVkhDJw google-site-verification=XcqIYCKBCZjObwHn5VVmsi92SLnaVx1XYruncLCUldM

RegistrationAmazon Registrar, Inc.

registrar	Amazon Registrar, Inc.
registered	2020-01-23
expires	2027-01-23
last changed	2026-05-15
owner	c/o whoisproxy.com
nameservers	julissa.ns.cloudflare.com rory.ns.cloudflare.com
status	client transfer prohibited

registered 2020-01-23expires 2027-01-23

HTTPS certificate40 days left

valid	yes
issuer	Let's Encrypt
covers	posthog.com
protocol	TLSv1.3

issued 2026-09-13expires 2026-12-12

DNSSECsecure

Domain is properly signed — chain validated by an independent validating resolver

. → com → posthog.com

Email authenticationexcellent

SPF	pass `v=spf1 include:_spf.google.com include:mail.zendesk.com include:servers.mcsv.net include:spf.mandrillapp.com include:amazonses.com include:mailgun.org -all`
DMARC	pass policy quarantine
DKIM	found: google, k1

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 155/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

30/45missing: CAA Records, DKIM Presence

Advanced Security

20/25missing: IPv6 Support

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 5 lookups

SURBL MultidomainURIBL MultidomainSpamCop216.150.1.1Barracuda216.150.1.1UCEPROTECT Level 1216.150.1.1

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=posthog.com" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=posthog.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on posthog.com. Reference: /llms.txt.

IPv6. Does posthog.com work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch posthog.com. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days