Yes — api.si.edu has IPv6.

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

This is a saved measurement from 2026-11-01 01:59 UTC. Check api.si.edu live now

A
IPv6 readiness
Website, mail and DNS all work over IPv6.
Website over IPv6
api.si.edu has 2 IPv6 addresses and answers on every one we tested.
✓ 2600:1f12:18a:7d01:b3fb:4329:2d20:18db answers · 443✓ 2600:1f12:18a:7d00:6bcf:d9f7:9330:a1a2 answers · 443
yes
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
6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
a1-88.akam.net ✓a9-64.akam.net ✓a11-67.akam.net ✓a24-67.akam.net ✓a26-66.akam.net ✓a28-65.akam.net ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 404.
https://api.si.edu/ via 2600:1f12:18a:7d01:b3fb:4329:2d20:18db → 404
works

Nothing keeping you from an A

  1. Nothing to fix
    Show it off: add the badge to your README.
    [![IPv6](https://aaaa.bot/badge/api.si.edu.svg)](https://aaaa.bot/api.si.edu)

Check again

api.si.edu  Has IPv6

Alias ofapi-si-edu.domains.api.data.gov → api.si.edu.external-domains-production.cloud.gov
A (IPv4)56.137.180.131
52.61.34.108
AAAA (IPv6)2600:1f12:18a:7d01:b3fb:4329:2d20:18db
2600:1f12:18a:7d00:6bcf:d9f7:9330:a1a2

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/jTra8icCPO · How we measure

Checked 2026-11-01 01:59:05 UTC. Full DNS report: dns.pizza/domain/api.si.edu · JSON: /api/v1/api.si.edu