Version information:

$ ipfs version --all
go-ipfs version: 0.4.20-dev-221d1b13a
Repo version: 7
System version: amd64/linux
Golang version: go1.12

Type: bug

Description:

If you have a private IPv6 address, say such as fec0::, ipfs will announce this. If you do ipfs init --profile server, there's a very hefty list of IPv4s to avoid, but not the same for IPv6.

https://en.wikipedia.org/wiki/Reserved_IP_addresses#IPv6

This seems like a pretty easy patch to write up. If you can confirm this is not intended behavior, I can open a PR.

(I also see swarm announcements for 127.0.0.1, I'm not sure if that's a bad thing or not.)