Yes — callsync.cloud has IPv6.

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

Measured 2026-11-02 15:12 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check callsync.cloud now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 callsync.cloud has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::6815:ebd answers · 443✓ 2606:4700:3031::ac43:a029 answers · 443	yes
www over IPv6 www.callsync.cloud has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::ac43:a029 answers · 443✓ 2606:4700:3037::6815:ebd answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. callsync-cloud.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. mariah.ns.cloudflare.com ✓ray.ns.cloudflare.com ✓	yes

First measured 2026-11-02; last confirmed 2026-11-02.

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

https://callsync.cloud/ via 2606:4700:3037::6815:ebd → 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/callsync.cloud.svg)](https://aaaa.bot/callsync.cloud)

Check again

callsync.cloud Has IPv6

A (IPv4)	172.67.160.41 104.21.14.189
AAAA (IPv6)	2606:4700:3037::6815:ebd 2606:4700:3031::ac43:a029

www.callsync.cloud Has IPv6

A (IPv4)	172.67.160.41 104.21.14.189
AAAA (IPv6)	2606:4700:3031::ac43:a029 2606:4700:3037::6815:ebd

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: callsync.cloud
Measured 2026-11-02 15:12:01 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.160.41, 104.21.14.189
AAAA (IPv6): 2606:4700:3037::6815:ebd, 2606:4700:3031::ac43:a029
www AAAA:    2606:4700:3031::ac43:a029, 2606:4700:3037::6815:ebd

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: callsync.cloud has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::6815:ebd: answers (TCP 443)
    2606:4700:3031::ac43:a029: answers (TCP 443)
- www over IPv6: www.callsync.cloud has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::ac43:a029: answers (TCP 443)
    2606:4700:3037::6815:ebd: 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: HTTP 200.
    https://callsync.cloud/ via 2606:4700:3037::6815:ebd -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/KoKFuh1RSg

Permanent link: aaaa.bot/r/KoKFuh1RSg · How we measure

Checked 2026-11-02 15:12:01 UTC. Full DNS report: dns.pizza/domain/callsync.cloud · Age, certificate and blocklists: how.is/callsync.cloud · JSON: /api/v1/callsync.cloud