This is what I get if I run mdns-scan on my ubuntu server:
ignacio@mini-server:~$ mdns-scan
+ Nest 8298._hap._tcp.local
+ Homebridge 2FB2 2A59._hap._tcp.local
+ Govee C435._hap._tcp.local
+ SHIELD-Android-TV-af1054f10c021c17fb736d7393e96c98._googlecast._tcp.local
+ af1054f1-0c02-1c17-fb73-6d7393e96c98._googlezone._tcp.local
+ synology._http._tcp.local
+ Google-Home-Mini-0e77d706d85241cb645a38b6c72392be._googlecast._tcp.local
+ 0e77d706-d852-41cb-645a-38b6c72392be._googlezone._tcp.local
+ synology._webdavs._tcp.local
+ iTunes_Ctrl_001132554C4F6011._dacp._tcp.local
+ google-cast-group-809b15b4b30f4d70a0736ffaa84ba093._googlecast._tcp.local
+ Google-Nest-Mini-8efa0ce7aef0999460dd6b47c624e6ef._googlecast._tcp.local
+ google-nest-hub-max-b45440fbd0cadb9cfb8faa526b0c1b45._googlecast._tcp.local
+ google-cast-group-ba24b9950f6b4af1befeecdebd25652b._googlecast._tcp.local
+ 3251895042._zwave-js-server._tcp.local
+ 8efa0ce7-aef0-9994-60dd-6b47c624e6ef._googlezone._tcp.local
+ google-cast-group-ea432b1bfea0416491ab32d56718a82b._googlecast._tcp.local
+ b45440fb-d0ca-db9c-fb8f-aa526b0c1b45._googlezone._tcp.local
+ Google-Home-Mini-5d626d24c333bb989093e453b077a3e2._googlecast._tcp.local
+ 5d626d24-c333-bb98-9093-e453b077a3e2._googlezone._tcp.local
+ Casa._home-assistant._tcp.local
+ google-nest-hub-f1474465b40e4b3813b3d0c8b26c86de._googlecast._tcp.local
+ Big bedroom tv._androidtvremote2._tcp.local
+ Home Assistant Silicon Labs Multiprotocol #2E47._meshcop._udp.local
+ adb-0324616160712._adb._tcp.local
+ SHIELD._nv_shield_remote._tcp.local
+ SHIELD._androidtvremote2._tcp.local
+ 38c3d37d-9113-95bc-9984-5d44e95fe7dc._googlezone._tcp.local
+ SHIELD-Android-TV-6724a7342d620427e670f804145783a5._googlecast._tcp.local
+ Google-Home-Mini-eacf38f74adb8ac0d6ec2b105cf5dc80._googlecast._tcp.local
+ eacf38f7-4adb-8ac0-d6ec-2b105cf5dc80._googlezone._tcp.local
+ 41F1E2AE47766CD7-0000000092FE5905._matter._tcp.local
+ f1474465-b40e-4b38-13b3-d0c8b26c86de._googlezone._tcp.local
+ fb1e64a59d514c33883bcb5be095b767._mass._tcp.local
+ google-nest-hub-49cb4aa260f8b0cd05154c7d7ac6013f._googlecast._tcp.local
+ 49cb4aa2-60f8-b0cd-0515-4c7d7ac6013f._googlezone._tcp.local
https://community.home-assistant.io/t/matter-server-with-docker-not-working-correctly/642336/2
Matter require an enabled and working IPv6 network.
DNSSD is DNS discovery for IPv6.