Hi, The IPv6 ABNF was not supporting the following compressed form ::10.18.5.97 IPV6 ABNF IPv6reference = "[" IPv6address "]" IPv6address = hexpart [ ":" IPv4address ] hexpart = hexseq / hexseq "::" [ hexseq ] / "::" [ hexseq ] hexseq = hex4 *( ":" hex4) hex4 = 1*4HEXDIG port = 1*DIGIT so the CORRECTED ABNF could be IPv6reference = "[" IPv6address "]" IPv6address = ( hexpart [ ":" IPv4address ] ) / ( "::" IPv4address ) hexpart = hexseq / hexseq "::" [ hexseq ] / "::" [ hexseq ] hexseq = hex4 *( ":" hex4) hex4 = 1*4HEXDIG Regards, Srinivas R Thota HTIPL _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf