Yes — splitrailpayments.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 splitrailpayments.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::ac43:865d answers · 443✓ 2606:4700:3030::6815:199f answers · 443	yes
www over IPv6 www.splitrailpayments.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::ac43:865d answers · 443✓ 2606:4700:3030::6815:199f answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. fwd1.porkbun.com ✗fwd2.porkbun.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. arvind.ns.cloudflare.com ✓bailey.ns.cloudflare.com ✓	yes

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

https://splitrailpayments.com/ via 2606:4700:3032::ac43:865d → 200

works

What's keeping splitrailpayments.com from an A

Mail servers without IPv6
fwd1.porkbun.com, fwd2.porkbun.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

splitrailpayments.com Has IPv6

A (IPv4)	104.21.25.159 172.67.134.93
AAAA (IPv6)	2606:4700:3032::ac43:865d 2606:4700:3030::6815:199f

www.splitrailpayments.com Has IPv6

A (IPv4)	172.67.134.93 104.21.25.159
AAAA (IPv6)	2606:4700:3032::ac43:865d 2606:4700:3030::6815:199f

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: splitrailpayments.com
Measured 2026-11-14 15:16:02 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.25.159, 172.67.134.93
AAAA (IPv6): 2606:4700:3032::ac43:865d, 2606:4700:3030::6815:199f
www AAAA:    2606:4700:3032::ac43:865d, 2606:4700:3030::6815:199f

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: splitrailpayments.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::ac43:865d: answers (TCP 443)
    2606:4700:3030::6815:199f: answers (TCP 443)
- www over IPv6: www.splitrailpayments.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::ac43:865d: answers (TCP 443)
    2606:4700:3030::6815:199f: 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://splitrailpayments.com/ via 2606:4700:3032::ac43:865d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/xnLzkJ7SRR

Permanent link: aaaa.bot/r/xnLzkJ7SRR · How we measure

Checked 2026-11-14 15:16:02 UTC. Full DNS report: dns.pizza/domain/splitrailpayments.com · Age, certificate and blocklists: how.is/splitrailpayments.com · JSON: /api/v1/splitrailpayments.com