Catalog a node in a DB2 UDB client.
cd /db2home/db2inst1/sqllib
list node directory
If a node has already been cataloged, depending on whether the node is local (first entry below) or remote (second entry below), you see results similar to this:
Node 1 entry: Node name = DB2NODE1 Comment = Directory entry type = LOCAL Protocol = LOCAL Instance name = DB2_01 Node 2 entry: Node name = DB2NODE2 Comment = Directory entry type = LOCAL Protocol = TCPIP Hostname = 10.22.85.228 Service name = 50001