2019-4-21 · RFC 1928 SOCKS Protocol Version 5 March 1996 5.Addressing In an address field (DST.ADDR, BND.ADDR), the ATYP field specifies the type of address contained within the field: o X'01' the address is a version-4 IP address, with a length of 4 octets o X'03' the address field contains a fully-qualified domain name.