Nostr.band isn't really offline, but their https and wss certificate is invalid.
Discussion
It is basically defunct. What about nostr.wine or relay.noswhere.com nostr:nprofile1qqs99d9qw67th0wr5xh05de4s9k0wjvnkxudkgptq8yg83vtulad30gpzemhxue69uhkzem8wghxummnw3ezumrpdejz7qg3waehxw309ahx7um5wghxcctwvshsz9thwden5te0wfjkccte9ejxzmt4wvhxjme0sd2wtf