Yes — ihg.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 ihg.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:c::17cd:6885 answers · 443✓ 2600:1408:c400:c::17cd:688c answers · 443	yes
www over IPv6 www.ihg.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:c::17cd:6885 answers · 443✓ 2600:1408:c400:c::17cd:688c answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mxa-0036c501.gslb.pphosted.com ✗mxb-0036c501.gslb.pphosted.com ✗	no
Nameservers have IPv6 6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. a1-131.akam.net ✓a4-64.akam.net ✓a26-67.akam.net ✓a16-66.akam.net ✓a5-65.akam.net ✓a9-66.akam.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.

https://ihg.com/ via 2600:1408:c400:c::17cd:6885 → 403

works

What's keeping ihg.com from an A

Mail servers without IPv6
mxa-0036c501.gslb.pphosted.com, mxb-0036c501.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

ihg.com Has IPv6

A (IPv4)	23.205.106.71 23.205.106.83
AAAA (IPv6)	2600:1408:c400:c::17cd:6885 2600:1408:c400:c::17cd:688c

www.ihg.com Has IPv6

Alias of	prod-web.ihg.edgekey.net → e101509.dscx.akamaiedge.net
A (IPv4)	23.205.106.71 23.205.106.83
AAAA (IPv6)	2600:1408:c400:c::17cd:6885 2600:1408:c400:c::17cd:688c

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: ihg.com
Measured 2026-11-01 18:26:14 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.205.106.71, 23.205.106.83
AAAA (IPv6): 2600:1408:c400:c::17cd:6885, 2600:1408:c400:c::17cd:688c
www AAAA:    2600:1408:c400:c::17cd:6885, 2600:1408:c400:c::17cd:688c

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: ihg.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:c::17cd:6885: answers (TCP 443)
    2600:1408:c400:c::17cd:688c: answers (TCP 443)
- www over IPv6: www.ihg.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:c::17cd:6885: answers (TCP 443)
    2600:1408:c400:c::17cd:688c: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 6 of 6 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: HTTP 403.
    https://ihg.com/ via 2600:1408:c400:c::17cd:6885 -> HTTP 403, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/FsF4qrEMV5

Permanent link: aaaa.bot/r/FsF4qrEMV5 · How we measure

Checked 2026-11-01 18:26:14 UTC. Full DNS report: dns.pizza/domain/ihg.com · JSON: /api/v1/ihg.com