Yes — membershipstack.com has IPv6.

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

This is a saved measurement from 2026-11-01 07:13 UTC. Check membershipstack.com live now

IPv6 readiness

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

Website over IPv6 membershipstack.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:9b13 answers · 443✓ 2606:4700:3032::6815:50e8 answers · 443	yes
www over IPv6 www.membershipstack.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::ac43:9b13 answers · 443✓ 2606:4700:3032::6815:50e8 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. eforward1.registrar-servers.com ✗eforward2.registrar-servers.com ✗eforward3.registrar-servers.com ✗eforward4.registrar-servers.com ✗eforward5.registrar-servers.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. dns1.registrar-servers.com ✓dns2.registrar-servers.com ✓	yes

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

https://membershipstack.com/ via 2606:4700:3033::ac43:9b13 → 200

works

What's keeping membershipstack.com from an A

Mail servers without IPv6
eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com, eforward4.registrar-servers.com, eforward5.registrar-servers.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

membershipstack.com Has IPv6

Alias of	custom.directify.app
A (IPv4)	104.21.80.232 172.67.155.19
AAAA (IPv6)	2606:4700:3033::ac43:9b13 2606:4700:3032::6815:50e8

www.membershipstack.com Has IPv6

Alias of	custom.directify.app
A (IPv4)	104.21.80.232 172.67.155.19
AAAA (IPv6)	2606:4700:3033::ac43:9b13 2606:4700:3032::6815:50e8

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: membershipstack.com
Measured 2026-11-01 07:13:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.80.232, 172.67.155.19
AAAA (IPv6): 2606:4700:3033::ac43:9b13, 2606:4700:3032::6815:50e8
www AAAA:    2606:4700:3033::ac43:9b13, 2606:4700:3032::6815:50e8

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: membershipstack.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:9b13: answers (TCP 443)
    2606:4700:3032::6815:50e8: answers (TCP 443)
- www over IPv6: www.membershipstack.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::ac43:9b13: answers (TCP 443)
    2606:4700:3032::6815:50e8: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 2 of 2 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 200.
    https://membershipstack.com/ via 2606:4700:3033::ac43:9b13 -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/JnK6GdW0-T

Permanent link: aaaa.bot/r/JnK6GdW0-T · How we measure

Checked 2026-11-01 07:13:35 UTC. Full DNS report: dns.pizza/domain/membershipstack.com · JSON: /api/v1/membershipstack.com