Yes — callusapp.tech has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 callusapp.tech has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:3baa answers · 443✓ 2606:4700:3034::ac43:b55c answers · 443	yes
www over IPv6 www.callusapp.tech has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:3baa answers · 443✓ 2606:4700:3034::ac43:b55c 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. eleanor.ns.cloudflare.com ✓eric.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://callusapp.tech/ via 2606:4700:3037::6815:3baa → 302https://12alkshaybazaz.cloudflareaccess.com/cdn-cgi/access/login/callusapp.tech?kid=ab99e7b4c30a787285b6d0787583b087ed3e0e83207f3210b682b4f92c70578f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.fiFxXqizNsyMv8belCVZYsphviaKOHqH7HOI9u1Ij7J1FrmxAIhRR0lLgKU6Afs26TnIWPLLbihfP9zjBbMigDLIvaiywyouABbm2KTAFqcAlBpzEpF1O1ROnXG1F6LN0xyb6gf2_Xgx55mFM8nrmjahSSUpAnxihNQTXYcl2b4ArEq95z_hWbsra8vAajxdKwXsVFnk3sKhjt6252gZSo9LW6ntGl7AQNHQE7P-GjXKRMxZSBXXpFaTCMBBEVbJKZ2EJJD7qJHeKZLWiAxt4bz3sTBI4borvHrrPg80Z0S6w2wYMhOBiCoysyp6IUnrTUncVSR3DQTzIc34dnJc5w&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/callusapp.tech.svg)](https://aaaa.bot/callusapp.tech)

Check again

callusapp.tech Has IPv6

A (IPv4)	172.67.181.92 104.21.59.170
AAAA (IPv6)	2606:4700:3037::6815:3baa 2606:4700:3034::ac43:b55c

www.callusapp.tech Has IPv6

A (IPv4)	104.21.59.170 172.67.181.92
AAAA (IPv6)	2606:4700:3037::6815:3baa 2606:4700:3034::ac43:b55c

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: callusapp.tech
Measured 2026-11-10 21:40:24 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.181.92, 104.21.59.170
AAAA (IPv6): 2606:4700:3037::6815:3baa, 2606:4700:3034::ac43:b55c
www AAAA:    2606:4700:3037::6815:3baa, 2606:4700:3034::ac43:b55c

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: callusapp.tech has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:3baa: answers (TCP 443)
    2606:4700:3034::ac43:b55c: answers (TCP 443)
- www over IPv6: www.callusapp.tech has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:3baa: answers (TCP 443)
    2606:4700:3034::ac43:b55c: 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://callusapp.tech/ via 2606:4700:3037::6815:3baa -> HTTP 302, certificate: valid
    https://12alkshaybazaz.cloudflareaccess.com/cdn-cgi/access/login/callusapp.tech?kid=ab99e7b4c30a787285b6d0787583b087ed3e0e83207f3210b682b4f92c70578f&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.fiFxXqizNsyMv8belCVZYsphviaKOHqH7HOI9u1Ij7J1FrmxAIhRR0lLgKU6Afs26TnIWPLLbihfP9zjBbMigDLIvaiywyouABbm2KTAFqcAlBpzEpF1O1ROnXG1F6LN0xyb6gf2_Xgx55mFM8nrmjahSSUpAnxihNQTXYcl2b4ArEq95z_hWbsra8vAajxdKwXsVFnk3sKhjt6252gZSo9LW6ntGl7AQNHQE7P-GjXKRMxZSBXXpFaTCMBBEVbJKZ2EJJD7qJHeKZLWiAxt4bz3sTBI4borvHrrPg80Z0S6w2wYMhOBiCoysyp6IUnrTUncVSR3DQTzIc34dnJc5w&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/3bZHfVoo2o

Permanent link: aaaa.bot/r/3bZHfVoo2o · How we measure

Checked 2026-11-10 21:40:24 UTC. Full DNS report: dns.pizza/domain/callusapp.tech · Age, certificate and blocklists: how.is/callusapp.tech · JSON: /api/v1/callusapp.tech