Yes — startuptracker.app has IPv6.

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

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 startuptracker.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::6815:2c24 answers · 443✓ 2606:4700:3031::ac43:c2a4 answers · 443	yes
www over IPv6 www.startuptracker.app has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3032::6815:2c24 answers · 443✓ 2606:4700:3031::ac43:c2a4 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. diva.ns.cloudflare.com ✓ernest.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://startuptracker.app/ via 2606:4700:3032::6815:2c24 → 302https://komodo-products.cloudflareaccess.com/cdn-cgi/access/login/startuptracker.app?kid=b1b5622f44e2009345e19dd5b359d2e977c86dfc7a69d8a5e949b7127dbf76f8&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.eyJ0eXBlIjoibWV0YSIsImF1ZCI6ImIxYjU2MjJmNDRlMjAwOTM0NWUxOWRkNWIzNTlkMmU5NzdjODZkZmM3YTY5ZDhhNWU5NDliNzEyN2RiZjc2ZjgiLCJob3N0bmFtZSI6InN0YXJ0dXB0cmFja2VyLmFwcCIsInJlZGlyZWN0X3VybCI6Ii8iLCJzZXJ2aWNlX3Rva2VuX3N0YXR1cyI6ZmFsc2UsImlzX3dhcnAiOmZhbHNlLCJpc19nYXRld2F5IjpmYWxzZSwiZXhwIjoxNzkzODc5MzQyLCJuYmYiOjE3OTM4NzkwNDIsImlhdCI6MTc5Mzg3OTA0MiwiYXV0aF9zdGF0dXMiOiJOT05FIiwibXRsc19hdXRoIjp7ImNlcnRfaXNzdWVyX2RuIjoiIiwiY2VydF9zZXJpYWwiOiIiLCJjZXJ0X2lzc3Vlcl9za2kiOiIiLCJjZXJ0X3ByZXNlbnRlZCI6ZmFsc2UsImNvbW1vbl9uYW1lIjoiIiwiYXV0aF9zdGF0dXMiOiJOT05FIn0sInJlYWxfY291bnRyeSI6IlVTIiwiYXBwX3Nlc3Npb25faGFzaCI6ImEwZjNjZGM1YWNlNzk5YzJlYzA4YTliY2Y2MTNjOWE1NzU3M2I5ODM4ZjU2MjMwZGFlNzUwMTViNjA2MjVhZTYifQ.U70HIUrDv82pZVfLG-5Wp9O2krubJmFGFNlBxRrE1oSQn47dlrhmUdSea47Eod4BdKu_WreZw5qDfsxT9h0O6k3ns_COe1tiEfWBZB1AtFHSjxxumfvCHcZyne9JDCDTS8Ke9a6aNpxP5JW9vVc6niAUf9kEYnW3qvy6lTvz1TuLjD83fTOYLfTF-XLDT_bJ4iaq_xBvQ2VLho7bp-iEjDjELsdmPdJoiw4RqdrgC7Wgd_lDJU2IdPVFE6kWRh77DIiXpE-gLtHHI3viggQU-_6kd4afuOHimmfIRfwVfd-ySkVWUyo7z_9Cv8GmeEyti8W2tMgkQQDX40u59NZY0Q&redirect_url=%2F via 2606:4700:300a::6813:c31d → 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/startuptracker.app.svg)](https://aaaa.bot/startuptracker.app)

Check again

startuptracker.app Has IPv6

A (IPv4)	172.67.194.164 104.21.44.36
AAAA (IPv6)	2606:4700:3032::6815:2c24 2606:4700:3031::ac43:c2a4

www.startuptracker.app Has IPv6

A (IPv4)	172.67.194.164 104.21.44.36
AAAA (IPv6)	2606:4700:3032::6815:2c24 2606:4700:3031::ac43:c2a4

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: startuptracker.app
Measured 2026-11-05 11:44:02 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.194.164, 104.21.44.36
AAAA (IPv6): 2606:4700:3032::6815:2c24, 2606:4700:3031::ac43:c2a4
www AAAA:    2606:4700:3032::6815:2c24, 2606:4700:3031::ac43:c2a4

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: startuptracker.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::6815:2c24: answers (TCP 443)
    2606:4700:3031::ac43:c2a4: answers (TCP 443)
- www over IPv6: www.startuptracker.app has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3032::6815:2c24: answers (TCP 443)
    2606:4700:3031::ac43:c2a4: 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://startuptracker.app/ via 2606:4700:3032::6815:2c24 -> HTTP 302, certificate: valid
    https://komodo-products.cloudflareaccess.com/cdn-cgi/access/login/startuptracker.app?kid=b1b5622f44e2009345e19dd5b359d2e977c86dfc7a69d8a5e949b7127dbf76f8&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.U70HIUrDv82pZVfLG-5Wp9O2krubJmFGFNlBxRrE1oSQn47dlrhmUdSea47Eod4BdKu_WreZw5qDfsxT9h0O6k3ns_COe1tiEfWBZB1AtFHSjxxumfvCHcZyne9JDCDTS8Ke9a6aNpxP5JW9vVc6niAUf9kEYnW3qvy6lTvz1TuLjD83fTOYLfTF-XLDT_bJ4iaq_xBvQ2VLho7bp-iEjDjELsdmPdJoiw4RqdrgC7Wgd_lDJU2IdPVFE6kWRh77DIiXpE-gLtHHI3viggQU-_6kd4afuOHimmfIRfwVfd-ySkVWUyo7z_9Cv8GmeEyti8W2tMgkQQDX40u59NZY0Q&redirect_url=%2F via 2606:4700:300a::6813:c31d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/5VXtTSLhb1

Permanent link: aaaa.bot/r/5VXtTSLhb1 · How we measure

Checked 2026-11-05 11:44:02 UTC. Full DNS report: dns.pizza/domain/startuptracker.app · Age, certificate and blocklists: how.is/startuptracker.app · JSON: /api/v1/startuptracker.app