Yes — calendly.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 calendly.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:440d::6812:29af answers · 443✓ 2606:4700:4403::ac40:9251 answers · 443	yes
www over IPv6 www.calendly.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:4403::ac40:9251 answers · 443✓ 2606:4700:440d::6812:29af answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx3.googlemail.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. hope.ns.cloudflare.com ✓roan.ns.cloudflare.com ✓	yes

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

https://calendly.com/ via 2606:4700:440d::6812:29af → 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/calendly.com.svg)](https://aaaa.bot/calendly.com)

Check again

calendly.com Has IPv6

A (IPv4)	172.64.146.81 104.18.41.175
AAAA (IPv6)	2606:4700:440d::6812:29af 2606:4700:4403::ac40:9251

www.calendly.com Has IPv6

A (IPv4)	104.18.41.175 172.64.146.81
AAAA (IPv6)	2606:4700:4403::ac40:9251 2606:4700:440d::6812:29af

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: calendly.com
Measured 2026-10-30 21:04:35 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.64.146.81, 104.18.41.175
AAAA (IPv6): 2606:4700:440d::6812:29af, 2606:4700:4403::ac40:9251
www AAAA:    2606:4700:4403::ac40:9251, 2606:4700:440d::6812:29af

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: calendly.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:440d::6812:29af: answers (TCP 443)
    2606:4700:4403::ac40:9251: answers (TCP 443)
- www over IPv6: www.calendly.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:4403::ac40:9251: answers (TCP 443)
    2606:4700:440d::6812:29af: 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://calendly.com/ via 2606:4700:440d::6812:29af -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/zt5LBWphIP

Permanent link: aaaa.bot/r/zt5LBWphIP · How we measure

Checked 2026-10-30 21:04:35 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/calendly.com · JSON: /api/v1/calendly.com