Yes — diffseal.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 diffseal.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::6815:13f6 answers · 443✓ 2606:4700:3030::ac43:be84 answers · 443	yes
www over IPv6 www.diffseal.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:be84 answers · 443✓ 2606:4700:3030::6815:13f6 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. route1.mx.cloudflare.net ✓route3.mx.cloudflare.net ✓route2.mx.cloudflare.net ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. charles.ns.cloudflare.com ✓marlowe.ns.cloudflare.com ✓	yes

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

https://diffseal.com/ via 2606:4700:3030::6815:13f6 → 302https://viktor-voltaire.cloudflareaccess.com/cdn-cgi/access/login/diffseal.com?kid=9673c0bb4dc2c71e53861f8aa1b27279c96a96448acf5cf40978da3f939e6440&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjBkMzRhZDliNmZjNDkxZDFkM2U3OWFhZWEwMzkyNGY3YjYxZjE1MjNiZmZiMDRmYmVjOWQxMWJjNDAyYjI5YjAifQ.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.B9PKXPJReydkMQ3sNbCIHdVxTFsKZOsRH28xhl9z4JHw2nk3UgVWffQAktWG_5VA3kq6IJnPt1PJLwwZ4Zdc6npr_OsDs1n1fNa-VANNg-JYSoA30jakk3HEAnNoVKTHHeNWUvm0P6_76yVYMvuJR7KlFkC3JRoxnNtHT7PlvQu-kmNJIJtxja_HaoGPetgbDCgYrRRMkyFrcOZ8BFPgyKV6c0PoJ5JFmzxKcjmSSugOMz71nypasodPa4gwXiaHiX0T9C2eCPaRSvccDqVQARRYSLU_Xi56TbxJKpF2fCQdl4qAoqfGLvfA8jsIzf3E7EGzP_Pd-Xxgou8yXR50Ng&redirect_url=%2F via 2606:4700:300a::6813:c21d → 200

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/diffseal.com.svg)](https://aaaa.bot/diffseal.com)

Check again

diffseal.com Has IPv6

A (IPv4)	172.67.190.132 104.21.19.246
AAAA (IPv6)	2606:4700:3030::6815:13f6 2606:4700:3030::ac43:be84

www.diffseal.com Has IPv6

A (IPv4)	172.67.190.132 104.21.19.246
AAAA (IPv6)	2606:4700:3030::ac43:be84 2606:4700:3030::6815:13f6

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: diffseal.com
Measured 2026-11-04 14:44:16 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.190.132, 104.21.19.246
AAAA (IPv6): 2606:4700:3030::6815:13f6, 2606:4700:3030::ac43:be84
www AAAA:    2606:4700:3030::ac43:be84, 2606:4700:3030::6815:13f6

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: diffseal.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::6815:13f6: answers (TCP 443)
    2606:4700:3030::ac43:be84: answers (TCP 443)
- www over IPv6: www.diffseal.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:be84: answers (TCP 443)
    2606:4700:3030::6815:13f6: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server 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 after 1 redirect: HTTP 200.
    https://diffseal.com/ via 2606:4700:3030::6815:13f6 -> HTTP 302, certificate: valid
    https://viktor-voltaire.cloudflareaccess.com/cdn-cgi/access/login/diffseal.com?kid=9673c0bb4dc2c71e53861f8aa1b27279c96a96448acf5cf40978da3f939e6440&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjBkMzRhZDliNmZjNDkxZDFkM2U3OWFhZWEwMzkyNGY3YjYxZjE1MjNiZmZiMDRmYmVjOWQxMWJjNDAyYjI5YjAifQ.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.B9PKXPJReydkMQ3sNbCIHdVxTFsKZOsRH28xhl9z4JHw2nk3UgVWffQAktWG_5VA3kq6IJnPt1PJLwwZ4Zdc6npr_OsDs1n1fNa-VANNg-JYSoA30jakk3HEAnNoVKTHHeNWUvm0P6_76yVYMvuJR7KlFkC3JRoxnNtHT7PlvQu-kmNJIJtxja_HaoGPetgbDCgYrRRMkyFrcOZ8BFPgyKV6c0PoJ5JFmzxKcjmSSugOMz71nypasodPa4gwXiaHiX0T9C2eCPaRSvccDqVQARRYSLU_Xi56TbxJKpF2fCQdl4qAoqfGLvfA8jsIzf3E7EGzP_Pd-Xxgou8yXR50Ng&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/KiNVkaX1bo

Permanent link: aaaa.bot/r/KiNVkaX1bo · How we measure

Checked 2026-11-04 14:44:16 UTC. Full DNS report: dns.pizza/domain/diffseal.com · Age, certificate and blocklists: how.is/diffseal.com · JSON: /api/v1/diffseal.com