Yes — box.com has IPv6.

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

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 box.com has an AAAA record and answers on it. ✓ 2620:117:bff0:12d:: answers · 443	yes
www over IPv6 www.box.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2620:117:bfb0:21:: answers · 443✓ 2620:117:bfb0:20:: answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-00172704.gslb.pphosted.com ✗mxb-00172704.gslb.pphosted.com ✗	no
Nameservers have IPv6 8 of 8 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. dns1.p09.nsone.net ✓dns2.p09.nsone.net ✓dns3.p09.nsone.net ✓dns4.p09.nsone.net ✓ns01.box-ns.com ✓ns02.box-ns.com ✓ns03.box-ns.com ✓ns04.box-ns.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.

https://box.com/ via 2620:117:bff0:12d:: → 301https://www.box.com/ via 2620:117:bfb0:21:: → 200

works

What's keeping box.com from an A

Mail servers without IPv6
mxa-00172704.gslb.pphosted.com, mxb-00172704.gslb.pphosted.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

box.com Has IPv6

A (IPv4)	74.112.186.157
AAAA (IPv6)	2620:117:bff0:12d::

www.box.com Has IPv6

Alias of	www.box.com.cdn.cloudflare.net
A (IPv4)	103.116.7.20 103.116.7.21
AAAA (IPv6)	2620:117:bfb0:21:: 2620:117:bfb0:20::

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

IPv6 measurement: box.com
Measured 2026-10-31 02:04:32 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    74.112.186.157
AAAA (IPv6): 2620:117:bff0:12d::
www AAAA:    2620:117:bfb0:21::, 2620:117:bfb0:20::

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: box.com has an AAAA record and answers on it.
    2620:117:bff0:12d::: answers (TCP 443)
- www over IPv6: www.box.com has 2 IPv6 addresses and answers on every one we tested.
    2620:117:bfb0:21::: answers (TCP 443)
    2620:117:bfb0:20::: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 8 of 8 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).

HTTPS over IPv6 (not graded): Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.
    https://box.com/ via 2620:117:bff0:12d:: -> HTTP 301, certificate: valid
    https://www.box.com/ via 2620:117:bfb0:21:: -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/MQmBzZuEy4

Permanent link: aaaa.bot/r/MQmBzZuEy4 · How we measure

Checked 2026-10-31 02:04:32 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/box.com · JSON: /api/v1/box.com