syncodia-booking.app 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 syncodia-booking.app has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4. ✗ 2001:1680:101:8bd::1 no answer	broken
www over IPv6 www.syncodia-booking.app has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4. ✗ 2001:1680:101:8bd::1 no answer	broken
Mail servers (MX) have IPv6 Every mail server has an AAAA record. mail1.hosttech.eu ✓mail2.hosttech.eu ✓	yes
Nameservers have IPv6 3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns3.hosttech.ch ✓ns2.hosttech.ch ✓ns1.hosttech.ch ✓	yes

What's keeping syncodia-booking.app from an A

Fix or remove the AAAA record for syncodia-booking.app
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.
Fix or remove the AAAA record for www.syncodia-booking.app
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

syncodia-booking.app Has IPv6

A (IPv4)	185.101.158.113
AAAA (IPv6)	2001:1680:101:8bd::1

www.syncodia-booking.app Has IPv6

A (IPv4)	185.101.158.113
AAAA (IPv6)	2001:1680:101:8bd::1

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: syncodia-booking.app
Measured 2026-11-11 09:25:34 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    185.101.158.113
AAAA (IPv6): 2001:1680:101:8bd::1
www AAAA:    2001:1680:101:8bd::1

Readiness grade F: Publishes IPv6 but doesn't answer on it — worse than having none.
- Website over IPv6: syncodia-booking.app has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4.
    2001:1680:101:8bd::1: no answer
- www over IPv6: www.syncodia-booking.app has an AAAA record, but nothing answered on ports 443 or 80. IPv6 visitors wait for a timeout before falling back to IPv4.
    2001:1680:101:8bd::1: no answer
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 3 of 3 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/BCs5e5lA-j

Permanent link: aaaa.bot/r/BCs5e5lA-j · How we measure

Checked 2026-11-11 09:25:34 UTC. Full DNS report: dns.pizza/domain/syncodia-booking.app · Age, certificate and blocklists: how.is/syncodia-booking.app · JSON: /api/v1/syncodia-booking.app