No — sandbox.umd.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
sandbox.umd.edu has no AAAA record.		no
www over IPv6
www.sandbox.umd.edu has an AAAA record and answers on it.
✓ 2607:f8b0:4004:c23::79 answers · 443
yes
Mail servers (MX) have IPv6
No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record.		no
Nameservers have IPv6
No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.
dnskrb3.umiacs.umd.edu ✗urchin.umiacs.umd.edu ✗whizbang.umiacs.umd.edu ✗smog.umiacs.umd.edu ✗
no

What's keeping sandbox.umd.edu from an A

  1. Give sandbox.umd.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
  2. Mail servers without IPv6
    Your domain's mail goes to its own address, which has no AAAA record.
  3. Nameservers without IPv6
    dnskrb3.umiacs.umd.edu, urchin.umiacs.umd.edu, whizbang.umiacs.umd.edu, smog.umiacs.umd.edu all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.

Check again

sandbox.umd.edu  IPv4 only

A (IPv4)128.8.120.240
AAAA (IPv6)none

www.sandbox.umd.edu  Has IPv6

Alias ofghs.googlehosted.com
A (IPv4)192.178.155.121
AAAA (IPv6)2607:f8b0:4004:c23::79

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/AUtWHCKvcv · How we measure

Checked 2026-11-02 19:10:43 UTC. Full DNS report: dns.pizza/domain/sandbox.umd.edu · Age, certificate and blocklists: how.is/sandbox.umd.edu · JSON: /api/v1/sandbox.umd.edu