Yes — shelflift.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 shelflift.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:a7cb answers · 443✓ 2606:4700:3037::6815:4204 answers · 443	yes
www over IPv6 www.shelflift.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::ac43:a7cb answers · 443✓ 2606:4700:3037::6815:4204 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. evelyn.ns.cloudflare.com ✓garrett.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://shelflift.app/ via 2606:4700:3030::ac43:a7cb → 302https://tiny-hill-f258.cloudflareaccess.com/cdn-cgi/access/login/shelflift.app?kid=5dfa782177b298cc7b67cc03924ff321fc24ff13c7cd2cae2eb42ebaf987aea3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.Z1aRE1VPd4rxdDCJSNtrZK1wy0hOvzImg95DrlqIOVMs1EwDyQs7cJ7jIAUIYoIcUEJ-Q4ZOpzYzvhL1I6GLJ_MfORL9WXrpbEN5zX-FVWQPwA-a_m3ZV432_YiZ0C94ry4KToyVl9TmWVCr5dw9Ejf38ZCCaIgdwQO-yZYyuA2B-I9CYbpQkFmRqA0KFTuLzqXv5jT9S3NpIq3AsjVkCZPzWuiAd94cXYXWGK6a80X2FjKwlsVQ6Jc8fKOuEdz8WudUzqV-0ZAkJmGL6_wOCP5UqS2rfEAzzUnU6k_3R2LC_rS-j5eXN008gTb08ITZoUad4ax9L__jm5tGUxO0zA&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/shelflift.app.svg)](https://aaaa.bot/shelflift.app)

Check again

shelflift.app Has IPv6

A (IPv4)	104.21.66.4 172.67.167.203
AAAA (IPv6)	2606:4700:3030::ac43:a7cb 2606:4700:3037::6815:4204

www.shelflift.app Has IPv6

A (IPv4)	172.67.167.203 104.21.66.4
AAAA (IPv6)	2606:4700:3030::ac43:a7cb 2606:4700:3037::6815:4204

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: shelflift.app
Measured 2026-11-14 16:46:23 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.66.4, 172.67.167.203
AAAA (IPv6): 2606:4700:3030::ac43:a7cb, 2606:4700:3037::6815:4204
www AAAA:    2606:4700:3030::ac43:a7cb, 2606:4700:3037::6815:4204

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: shelflift.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:a7cb: answers (TCP 443)
    2606:4700:3037::6815:4204: answers (TCP 443)
- www over IPv6: www.shelflift.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::ac43:a7cb: answers (TCP 443)
    2606:4700:3037::6815:4204: 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://shelflift.app/ via 2606:4700:3030::ac43:a7cb -> HTTP 302, certificate: valid
    https://tiny-hill-f258.cloudflareaccess.com/cdn-cgi/access/login/shelflift.app?kid=5dfa782177b298cc7b67cc03924ff321fc24ff13c7cd2cae2eb42ebaf987aea3&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.Z1aRE1VPd4rxdDCJSNtrZK1wy0hOvzImg95DrlqIOVMs1EwDyQs7cJ7jIAUIYoIcUEJ-Q4ZOpzYzvhL1I6GLJ_MfORL9WXrpbEN5zX-FVWQPwA-a_m3ZV432_YiZ0C94ry4KToyVl9TmWVCr5dw9Ejf38ZCCaIgdwQO-yZYyuA2B-I9CYbpQkFmRqA0KFTuLzqXv5jT9S3NpIq3AsjVkCZPzWuiAd94cXYXWGK6a80X2FjKwlsVQ6Jc8fKOuEdz8WudUzqV-0ZAkJmGL6_wOCP5UqS2rfEAzzUnU6k_3R2LC_rS-j5eXN008gTb08ITZoUad4ax9L__jm5tGUxO0zA&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/tsQjcqHbfK

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

Checked 2026-11-14 16:46:23 UTC. Full DNS report: dns.pizza/domain/shelflift.app · Age, certificate and blocklists: how.is/shelflift.app · JSON: /api/v1/shelflift.app