truecaller.com publishes IPv6 but doesn't answer on it.

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

IPv6 readiness

Publishes IPv6 but doesn't answer on it — worse than having none.

Website over IPv6 truecaller.com has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4. ✗ 2406:da00:a000::fce:9a6f no answer✗ 2406:da00:a000::36d:89b1 no answer	broken
www over IPv6 www.truecaller.com has 3 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:20::681a:882 answers · 443✓ 2606:4700:20::681a:982 answers · 443✓ 2606:4700:20::ac43:4674 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. alt2.aspmx.l.google.com ✓alt4.aspmx.l.google.com ✓aspmx.l.google.com ✓alt3.aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓	yes
Nameservers have IPv6 4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns-cloud-c2.googledomains.com ✓ns-cloud-c4.googledomains.com ✓ns-cloud-c3.googledomains.com ✓ns-cloud-c1.googledomains.com ✓	yes

What's keeping truecaller.com from an A

Fix or remove the AAAA record for truecaller.com
Something published an IPv6 address but nothing answers on it, so IPv6 visitors wait for a timeout first. Either make the server listen on IPv6 (and allow ports 443/80 through its firewall), or delete the AAAA record until it does.

Check again

truecaller.com Has IPv6

A (IPv4)	15.206.154.111 3.109.137.177
AAAA (IPv6)	2406:da00:a000::fce:9a6f 2406:da00:a000::36d:89b1

www.truecaller.com Has IPv6

Alias of	www.truecaller.com.cdn.cloudflare.net
A (IPv4)	172.67.70.116 104.26.8.130 104.26.9.130
AAAA (IPv6)	2606:4700:20::681a:882 2606:4700:20::681a:982 2606:4700:20::ac43:4674

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: truecaller.com
Measured 2026-11-01 12:16:47 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    15.206.154.111, 3.109.137.177
AAAA (IPv6): 2406:da00:a000::fce:9a6f, 2406:da00:a000::36d:89b1
www AAAA:    2606:4700:20::681a:882, 2606:4700:20::681a:982, 2606:4700:20::ac43:4674

Readiness grade F: Publishes IPv6 but doesn't answer on it — worse than having none.
- Website over IPv6: truecaller.com has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4.
    2406:da00:a000::fce:9a6f: no answer
    2406:da00:a000::36d:89b1: no answer
- www over IPv6: www.truecaller.com has 3 IPv6 addresses and answers on every one we tested.
    2606:4700:20::681a:882: answers (TCP 443)
    2606:4700:20::681a:982: answers (TCP 443)
    2606:4700:20::ac43:4674: answers (TCP 443)
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 4 of 4 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).
No TLS or HTTP request was made.
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/m1Gvw8mtGP

Permanent link: aaaa.bot/r/m1Gvw8mtGP · How we measure

Checked 2026-11-01 12:16:47 UTC. Full DNS report: dns.pizza/domain/truecaller.com · JSON: /api/v1/truecaller.com