Identifies the number of the service address.
NOTE 1: This field may contain a provider assigned house number.
USAGE: This field is conditional.
NOTE 1: Required when the AFT Field is āCā.
NOTE 2: Optional when the SASN field is populated.
NOTE 3: Otherwise prohibited.
DATA CHARACTERISTICS: 10 alpha/numeric characters
EXAMPLE: 4 5 0
NOTE 1: Where 450 is the address number for the following address example: 25W 450 1/2 SW Camino Ramon Lane NW, Floor 12, Wing 2, Suite 23A.