DALnet is an Internet Relay Chat (IRC) network that is currently populated by a stable population of around 14,000 users in about 7,000 channels, with 33 servers making up the network.
DALnet is accessible by connecting with an IRC client to an active DALnet server on ports 6660 through 6669, and 7000. SSL users can connect on port 6697 as well. The generic round-robin address is irc.dal.net.
Read more about DALnet: History