Yes — genome.gov has IPv6.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

Measured 2026-11-13 11:09 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check genome.gov now

B
IPv6 readiness
Works over IPv6, with one gap: www doesn't fully work over IPv6.
Website over IPv6
genome.gov has an AAAA record and answers on it.
✓ 2607:f220:404:1002::80e7:5b1e answers · 443
yes
www over IPv6
www.genome.gov has no AAAA record.		no
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.		yes
Nameservers have IPv6
3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns.nih.gov ✓ns2.nih.gov ✓ns3.nih.gov ✓
yes

First measured 2026-11-04; last confirmed 2026-11-13.

HTTPS over IPv6 · not part of the grade yet
Redirects to www.genome.gov, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.
https://genome.gov/ via 2607:f220:404:1002::80e7:5b1e → 301https://www.genome.gov/ · redirects to www.genome.gov, which has no IPv6 address
problem
 Which outside scripts, fonts, payments or chat genome.gov loads from have no IPv6.
 Load genome.gov over IPv6 from up to six other places — a second opinion.

What's keeping genome.gov from an A

  1. Add IPv6 for www.genome.gov
    www.genome.gov has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse genome.gov's AAAA record(s) for www. How to add an AAAA record
  2. A redirect leads off IPv6
    Redirects to www.genome.gov, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all. Give the redirect target IPv6 too, or redirect somewhere that has it.

Check again

genome.gov  Has IPv6

A (IPv4)128.231.91.30
AAAA (IPv6)2607:f220:404:1002::80e7:5b1e

www.genome.gov  IPv4 only

A (IPv4)52.45.214.169
AAAA (IPv6)none

Browsers on dual-stack networks will usually pick IPv6 here (the "Happy Eyeballs" algorithm races both and prefers v6).

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

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

Checked 2026-11-13 11:09:20 UTC. Full DNS report: dns.pizza/domain/genome.gov · Age, certificate and blocklists: how.is/genome.gov · JSON: /api/v1/genome.gov