No — posthog.com is IPv4 only.

Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.

Measured 2026-11-01 14:46 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check posthog.com now

D
IPv6 readiness
The website has no IPv6.
Website over IPv6
posthog.com has no AAAA record.		no
www over IPv6
www.posthog.com has no AAAA record.		no
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓
yes
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
rory.ns.cloudflare.com ✓julissa.ns.cloudflare.com ✓
yes

First measured 2026-11-01; last confirmed 2026-11-01.

What's keeping posthog.com from an A

  1. Give posthog.com an IPv6 address
    Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record
  2. www.posthog.com is an alias of 8eb78e9daddac53f.vercel-dns-016.com, which has no IPv6
    www.posthog.com is a CNAME, so it can't also have its own AAAA record. Ask whoever runs 8eb78e9daddac53f.vercel-dns-016.com to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6

Check again

posthog.com  IPv4 only

A (IPv4)216.150.1.1
AAAA (IPv6)none

www.posthog.com  IPv4 only

Alias of8eb78e9daddac53f.vercel-dns-016.com
A (IPv4)216.150.16.1
216.150.1.1
AAAA (IPv6)none

What this means

Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/FpTRO6clwo · How we measure

Checked 2026-11-01 14:46:21 UTC. Full DNS report: dns.pizza/domain/posthog.com · JSON: /api/v1/posthog.com