No — si.edu is IPv4 only.

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

D
IPv6 readiness
The website has no IPv6.
Website over IPv6
si.edu has no AAAA record.		no
www over IPv6
www.si.edu has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700::6812:6b answers · 443✓ 2606:4700::6812:16b answers · 443
yes
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
si-edu.mail.protection.outlook.com ✓
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

What's keeping si.edu from an A

  1. Give si.edu 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

Check again

si.edu  IPv4 only

A (IPv4)160.111.244.22
AAAA (IPv6)none

www.si.edu  Has IPv6

Alias ofwww.si.edu.cdn.cloudflare.net
A (IPv4)104.18.1.107
104.18.0.107
AAAA (IPv6)2606:4700::6812:6b
2606:4700::6812:16b

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/2pwz8aCPpB · How we measure

Checked 2026-10-31 19:23:37 UTC. Full DNS report: dns.pizza/domain/si.edu · JSON: /api/v1/si.edu