Yes — sellnextdoor.info has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 sellnextdoor.info has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::6815:62 answers · 443✓ 2606:4700:3034::ac43:96d3 answers · 443	yes
www over IPv6 www.sellnextdoor.info has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3030::6815:62 answers · 443✓ 2606:4700:3034::ac43:96d3 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. clarissa.ns.cloudflare.com ✓rodney.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://sellnextdoor.info/ via 2606:4700:3030::6815:62 → 302https://www.google.com/ via 2001:4860:482d:7700:: → 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/sellnextdoor.info.svg)](https://aaaa.bot/sellnextdoor.info)

Check again

sellnextdoor.info Has IPv6

A (IPv4)	104.21.0.98 172.67.150.211
AAAA (IPv6)	2606:4700:3030::6815:62 2606:4700:3034::ac43:96d3

www.sellnextdoor.info Has IPv6

A (IPv4)	172.67.150.211 104.21.0.98
AAAA (IPv6)	2606:4700:3030::6815:62 2606:4700:3034::ac43:96d3

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: sellnextdoor.info
Measured 2026-11-03 12:07:10 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.0.98, 172.67.150.211
AAAA (IPv6): 2606:4700:3030::6815:62, 2606:4700:3034::ac43:96d3
www AAAA:    2606:4700:3030::6815:62, 2606:4700:3034::ac43:96d3

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: sellnextdoor.info has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::6815:62: answers (TCP 443)
    2606:4700:3034::ac43:96d3: answers (TCP 443)
- www over IPv6: www.sellnextdoor.info has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3030::6815:62: answers (TCP 443)
    2606:4700:3034::ac43:96d3: 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://sellnextdoor.info/ via 2606:4700:3030::6815:62 -> HTTP 302, certificate: valid
    https://www.google.com/ via 2001:4860:482d:7700:: -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/Vs51Rh7wM7

Permanent link: aaaa.bot/r/Vs51Rh7wM7 · How we measure

Checked 2026-11-03 12:07:10 UTC. Full DNS report: dns.pizza/domain/sellnextdoor.info · Age, certificate and blocklists: how.is/sellnextdoor.info · JSON: /api/v1/sellnextdoor.info