Yes — zelabs.dev has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 zelabs.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:52cd answers · 443✓ 2606:4700:3034::ac43:a2e0 answers · 443	yes
www over IPv6 www.zelabs.dev has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3033::6815:52cd answers · 443✓ 2606:4700:3034::ac43:a2e0 answers · 443	yes
Mail servers (MX) have IPv6 No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record.	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ben.ns.cloudflare.com ✓danica.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://zelabs.dev/ via 2606:4700:3033::6815:52cd → 302https://bitter-unit-15a1.cloudflareaccess.com/cdn-cgi/access/login/zelabs.dev?kid=2ba0e0d7da183c9217d5b20a5a92289ea4794e5777810fc56792d2a91c97bd7a&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImE2OGQ1NWVmMmY1ZGJkMDQ3ZjNkZmYzYWZkMTk4NjMwNzNmYzkwMjIwNWQzMGU0MWI2YjA2NTVhNDZhY2VlM2EifQ.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.RIc2mrDc9xpahQRdfu4M7IhVd-IRRNMTESJ1L3a8TPg_j0M9aDKjfXyFmAC_hfye6K70DtUQVy0Wwzm3IGJhRu5N9qf4ljD6lIp9B2vZVpdMICuHvoaLG40ZuGAhvVKbNKIq-YhNHcnJROKGQB_LOFLJUF5cg7QzI_ET_xJA6xHuOBBbghHoMAup8l12f2y3PQYHVhu8ERxpIUotNhDCKJr-1fkzLqQ4ZEHSi0KQ5EMwGligr4ttYIthPdFt_61hmjyrrNIOf2POlt5L012dpOB1f5gu3cbGS6pFim-5radKrUVBA2sU70YAPWZoFoTvcwzVEIlq4mrRSrpa0PwTBw&redirect_url=%2F via 2606:4700:300a::6813:c31d → 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/zelabs.dev.svg)](https://aaaa.bot/zelabs.dev)

Check again

zelabs.dev Has IPv6

A (IPv4)	104.21.82.205 172.67.162.224
AAAA (IPv6)	2606:4700:3033::6815:52cd 2606:4700:3034::ac43:a2e0

www.zelabs.dev Has IPv6

A (IPv4)	172.67.162.224 104.21.82.205
AAAA (IPv6)	2606:4700:3033::6815:52cd 2606:4700:3034::ac43:a2e0

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: zelabs.dev
Measured 2026-11-07 17:13:14 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.82.205, 172.67.162.224
AAAA (IPv6): 2606:4700:3033::6815:52cd, 2606:4700:3034::ac43:a2e0
www AAAA:    2606:4700:3033::6815:52cd, 2606:4700:3034::ac43:a2e0

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: zelabs.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:52cd: answers (TCP 443)
    2606:4700:3034::ac43:a2e0: answers (TCP 443)
- www over IPv6: www.zelabs.dev has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3033::6815:52cd: answers (TCP 443)
    2606:4700:3034::ac43:a2e0: answers (TCP 443)
- Mail servers (MX) have IPv6: No MX records, so mail goes to the domain's own address (implicit MX). It 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://zelabs.dev/ via 2606:4700:3033::6815:52cd -> HTTP 302, certificate: valid
    https://bitter-unit-15a1.cloudflareaccess.com/cdn-cgi/access/login/zelabs.dev?kid=2ba0e0d7da183c9217d5b20a5a92289ea4794e5777810fc56792d2a91c97bd7a&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImE2OGQ1NWVmMmY1ZGJkMDQ3ZjNkZmYzYWZkMTk4NjMwNzNmYzkwMjIwNWQzMGU0MWI2YjA2NTVhNDZhY2VlM2EifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6IjJiYTBlMGQ3ZGExODNjOTIxN2Q1YjIwYTVhOTIyODllYTQ3OTRlNTc3NzgxMGZjNTY3OTJkMmE5MWM5N2JkN2EiLCJob3N0bmFtZSI6InplbGFicy5kZXYiLCJyZWRpcmVjdF91cmwiOiIvIiwic2VydmljZV90b2tlbl9zdGF0dXMiOmZhbHNlLCJpc193YXJwIjpmYWxzZSwiaXNfZ2F0ZXdheSI6ZmFsc2UsImV4cCI6MTc5NDA3MTg5NCwibmJmIjoxNzk0MDcxNTk0LCJpYXQiOjE3OTQwNzE1OTQsImF1dGhfc3RhdHVzIjoiTk9ORSIsIm10bHNfYXV0aCI6eyJjZXJ0X2lzc3Vlcl9kbiI6IiIsImNlcnRfc2VyaWFsIjoiIiwiY2VydF9pc3N1ZXJfc2tpIjoiIiwiY2VydF9wcmVzZW50ZWQiOmZhbHNlLCJjb21tb25fbmFtZSI6IiIsImF1dGhfc3RhdHVzIjoiTk9ORSJ9LCJyZWFsX2NvdW50cnkiOiJVUyIsImFwcF9zZXNzaW9uX2hhc2giOiJlN2I0MzExMTViMmZjNzJiZTVjMjY5NTY0ZGZmYjcwZDg3ZTkxNDRhYTVjNjhjZWFkNjgzZGFmZTg2ZDZjODkzIn0.RIc2mrDc9xpahQRdfu4M7IhVd-IRRNMTESJ1L3a8TPg_j0M9aDKjfXyFmAC_hfye6K70DtUQVy0Wwzm3IGJhRu5N9qf4ljD6lIp9B2vZVpdMICuHvoaLG40ZuGAhvVKbNKIq-YhNHcnJROKGQB_LOFLJUF5cg7QzI_ET_xJA6xHuOBBbghHoMAup8l12f2y3PQYHVhu8ERxpIUotNhDCKJr-1fkzLqQ4ZEHSi0KQ5EMwGligr4ttYIthPdFt_61hmjyrrNIOf2POlt5L012dpOB1f5gu3cbGS6pFim-5radKrUVBA2sU70YAPWZoFoTvcwzVEIlq4mrRSrpa0PwTBw&redirect_url=%2F via 2606:4700:300a::6813:c31d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/HuhWG2oQie

Permanent link: aaaa.bot/r/HuhWG2oQie · How we measure

Checked 2026-11-07 17:13:14 UTC. Full DNS report: dns.pizza/domain/zelabs.dev · Age, certificate and blocklists: how.is/zelabs.dev · JSON: /api/v1/zelabs.dev