Identifies the version of the Second Internet Protocol Address within the network interface device at a host or end user location when requesting dual stack capability with IPv4 and IPv6 enabled.
NOTE 1: When this field is populated without an associated IP Address then it shall be used by the provider to assign the IP Address using a pool of available addresses based on the format selected in this field. The American Registry for Internet Numbers (ARIN) assigns the pool of IP Addresses for US based services that may be used by a provider.
VALID ENTRIES:
4 = IPv4
6 = IPv6
NOTE 1: Valid entry of “4” is prohibited if IPAI field is “4”.
NOTE 2: Valid entry of “6” is prohibited if IPAI field is “6”.
USAGE: This field is conditional.
NOTE 1: Required when the IP ADDRESS2 field is populated
NOTE 2: Optional when the IPAI field is populated with “4” or “6”.
NOTE 3: Otherwise prohibited.
DATA CHARACTERISTICS: 1 alpha/numeric character
EXAMPLE: 6