Yes — ibm.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 ibm.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:5400:e87::3831 answers · 443✓ 2600:1408:5400:e94::3831 answers · 443	yes
www over IPv6 www.ibm.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2600:1408:c400:188a::1e89 answers · 443✓ 2600:1408:c400:1885::1e89 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx0a-001b2d05.pphosted.com ✗mx0b-001b2d05.pphosted.com ✗	no
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. dns1.p05.nsone.net ✓dns2.p05.nsone.net ✓dns3.p05.nsone.net ✓dns4.p05.nsone.net ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.

https://ibm.com/ via 2600:1408:5400:e87::3831 → 301https://www.ibm.com/ via 2600:1408:c400:188a::1e89 → 303https://www.ibm.com/us-en via 2600:1408:c400:188a::1e89 → 200

works

What's keeping ibm.com from an A

Mail servers without IPv6
mx0a-001b2d05.pphosted.com, mx0b-001b2d05.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

ibm.com Has IPv6

A (IPv4)	23.1.60.77
AAAA (IPv6)	2600:1408:5400:e87::3831 2600:1408:5400:e94::3831

www.ibm.com Has IPv6

Alias of	outer-global-dual.ibmcom-tls12.edgekey.net → e7817.dscx.akamaiedge.net
A (IPv4)	23.219.9.13
AAAA (IPv6)	2600:1408:c400:188a::1e89 2600:1408:c400:1885::1e89

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: ibm.com
Measured 2026-10-30 19:04:32 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    23.1.60.77
AAAA (IPv6): 2600:1408:5400:e87::3831, 2600:1408:5400:e94::3831
www AAAA:    2600:1408:c400:188a::1e89, 2600:1408:c400:1885::1e89

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: ibm.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:5400:e87::3831: answers (TCP 443)
    2600:1408:5400:e94::3831: answers (TCP 443)
- www over IPv6: www.ibm.com has 2 IPv6 addresses and answers on every one we tested.
    2600:1408:c400:188a::1e89: answers (TCP 443)
    2600:1408:c400:1885::1e89: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 4 of 4 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 2 redirects: HTTP 200.
    https://ibm.com/ via 2600:1408:5400:e87::3831 -> HTTP 301, certificate: valid
    https://www.ibm.com/ via 2600:1408:c400:188a::1e89 -> HTTP 303, certificate: valid
    https://www.ibm.com/us-en via 2600:1408:c400:188a::1e89 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/uNzQlQP50f

Permanent link: aaaa.bot/r/uNzQlQP50f · How we measure

Checked 2026-10-30 19:04:32 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/ibm.com · JSON: /api/v1/ibm.com