Via the Internet using TELNET you can connect to these well known DX Clusters;

WU3V Cluster Mega-Cluster NO4J Cluster NFDXA Cluster
KC8FT-6 Cluster SAPS Network WD5B Cluster Conway, AR
N6ND Cluster San Diego Cluster KA4PKB Cluster EAARC Cluster
N7TR Cluster E. Sierra DX W5AU Cluster N.W. LA DX Cluster

73`s and good DXing

De Richard VE2DX