Yes — uppsize.com has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 uppsize.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3036::ac43:ca54 answers · 443✓ 2606:4700:3031::6815:4507 answers · 443	yes
www over IPv6 www.uppsize.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3031::6815:4507 answers · 443✓ 2606:4700:3036::ac43:ca54 answers · 443	yes
Mail servers (MX) have IPv6 Every mail server has an AAAA record. smtp.google.com ✓	yes
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. hunts.ns.cloudflare.com ✓lovisa.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate after 2 redirects: HTTP 429.

https://uppsize.com/ via 2606:4700:3036::ac43:ca54 → 301https://www.instagram.com/uppsize_?obrf=bm1rajY5ZzNtbjU0 via 2a03:2880:f381:22:face:b00c:0:4420 → 302https://www.instagram.com/accounts/login/?next=https%3A%2F%2Fwww.instagram.com%2Fuppsize_%3Fobrf%3Dbm1rajY5ZzNtbjU0&is_from_rle via 2a03:2880:f381:22:face:b00c:0:4420 → 429

works

Nothing keeping you from an A

Nothing to fix
Show it off: add the badge to your README.
[![IPv6](https://aaaa.bot/badge/uppsize.com.svg)](https://aaaa.bot/uppsize.com)

Check again

uppsize.com Has IPv6

A (IPv4)	104.21.69.7 172.67.202.84
AAAA (IPv6)	2606:4700:3036::ac43:ca54 2606:4700:3031::6815:4507

www.uppsize.com Has IPv6

A (IPv4)	104.21.69.7 172.67.202.84
AAAA (IPv6)	2606:4700:3031::6815:4507 2606:4700:3036::ac43:ca54

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: uppsize.com
Measured 2026-11-12 15:26:02 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.69.7, 172.67.202.84
AAAA (IPv6): 2606:4700:3036::ac43:ca54, 2606:4700:3031::6815:4507
www AAAA:    2606:4700:3031::6815:4507, 2606:4700:3036::ac43:ca54

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: uppsize.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3036::ac43:ca54: answers (TCP 443)
    2606:4700:3031::6815:4507: answers (TCP 443)
- www over IPv6: www.uppsize.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3031::6815:4507: answers (TCP 443)
    2606:4700:3036::ac43:ca54: 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 after 2 redirects: HTTP 429.
    https://uppsize.com/ via 2606:4700:3036::ac43:ca54 -> HTTP 301, certificate: valid
    https://www.instagram.com/uppsize_?obrf=bm1rajY5ZzNtbjU0 via 2a03:2880:f381:22:face:b00c:0:4420 -> HTTP 302, certificate: valid
    https://www.instagram.com/accounts/login/?next=https%3A%2F%2Fwww.instagram.com%2Fuppsize_%3Fobrf%3Dbm1rajY5ZzNtbjU0&is_from_rle via 2a03:2880:f381:22:face:b00c:0:4420 -> HTTP 429, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/Bwt8zMT3DV

Permanent link: aaaa.bot/r/Bwt8zMT3DV · How we measure

Checked 2026-11-12 15:26:02 UTC. Full DNS report: dns.pizza/domain/uppsize.com · Age, certificate and blocklists: how.is/uppsize.com · JSON: /api/v1/uppsize.com