Yes — koschei.xyz has IPv6.

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

This is a saved measurement from 2026-11-02 15:36 UTC. Check koschei.xyz live now

IPv6 readiness

Website, mail and DNS all work over IPv6.

Website over IPv6 koschei.xyz has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3037::ac43:8cab answers · 443✓ 2606:4700:3031::6815:4134 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. dax.ns.cloudflare.com ✓gemma.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://koschei.xyz/ via 2606:4700:3037::ac43:8cab → 302https://koschei-xyz.cloudflareaccess.com/cdn-cgi/access/login/koschei.xyz?kid=e37efeb2c8f5a259cacd6f14946fde42c8b8c578f24d54ca290ae52eae1ab008&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.OjJP3xSUdXpgTpFH10YY58RNO2TyGILHDXE470EP9AlJP4nokfnsyhFTbD6nX64el9-pQRxcfKivnVN-NffRFmrZA_cU0gtSrPO7nHYpW48fP2ncwhdpQkv_yz1pHIiI0CITJ7vFh1sqE98rfBd-DlzCQoY5MPMDMh0AGw9r7cXISC2ufNJIRKIXRAzi8An-MN_7NBCkLy4YjtFWYgMi4SIqBHQ0mpp8lPdLMCRT1sbxskV2IlsYtx-dvKiCMpCrH3nTzG4bx7nd3l53uJoyD9EubgTwmCDOACSfS0J__FgnBtp5dPQDY_4h7xZYSwjKx5zNzh_Wu-WUsZXNAZEGig&redirect_url=%2F via 2606:4700:300a::6813:c21d → 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/koschei.xyz.svg)](https://aaaa.bot/koschei.xyz)

Check again

koschei.xyz Has IPv6

A (IPv4)	104.21.65.52 172.67.140.171
AAAA (IPv6)	2606:4700:3037::ac43:8cab 2606:4700:3031::6815:4134

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: koschei.xyz
Measured 2026-11-02 15:36:00 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.21.65.52, 172.67.140.171
AAAA (IPv6): 2606:4700:3037::ac43:8cab, 2606:4700:3031::6815:4134

Readiness grade A: Website, mail and DNS all work over IPv6.
- Website over IPv6: koschei.xyz has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3037::ac43:8cab: answers (TCP 443)
    2606:4700:3031::6815:4134: 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://koschei.xyz/ via 2606:4700:3037::ac43:8cab -> HTTP 302, certificate: valid
    https://koschei-xyz.cloudflareaccess.com/cdn-cgi/access/login/koschei.xyz?kid=e37efeb2c8f5a259cacd6f14946fde42c8b8c578f24d54ca290ae52eae1ab008&meta=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6Ijg2OGFmMjMzMzMwYTk2ZmFjNTUzMTBhMmQyN2E2MmQ1ZWM1YWY5Zjg3ZDBhOTg5OTNhMzk0MjZlMDg1NGI2NzcifQ.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.OjJP3xSUdXpgTpFH10YY58RNO2TyGILHDXE470EP9AlJP4nokfnsyhFTbD6nX64el9-pQRxcfKivnVN-NffRFmrZA_cU0gtSrPO7nHYpW48fP2ncwhdpQkv_yz1pHIiI0CITJ7vFh1sqE98rfBd-DlzCQoY5MPMDMh0AGw9r7cXISC2ufNJIRKIXRAzi8An-MN_7NBCkLy4YjtFWYgMi4SIqBHQ0mpp8lPdLMCRT1sbxskV2IlsYtx-dvKiCMpCrH3nTzG4bx7nd3l53uJoyD9EubgTwmCDOACSfS0J__FgnBtp5dPQDY_4h7xZYSwjKx5zNzh_Wu-WUsZXNAZEGig&redirect_url=%2F via 2606:4700:300a::6813:c21d -> HTTP 200, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/dUOvOfc5ak

Permanent link: aaaa.bot/r/dUOvOfc5ak · How we measure

Checked 2026-11-02 15:36:00 UTC. Full DNS report: dns.pizza/domain/koschei.xyz · Age, certificate and blocklists: how.is/koschei.xyz · JSON: /api/v1/koschei.xyz