In Delaware, resident and non-resident anglers age 16 and older are required to obtain a Delaware Fisherman Information Network (F.I.N.) number.
The free number is included as part of a Delaware fishing license purchase. License-exempt anglers, including Delaware residents 65 and older, may visit www.delaware-fin.com or call 800-432-9228 toll-free to obtain their free F.I.N. number.
source: DNREC Division of Fish and Wildlife