AS21633 137.227.96.0/21 CIDR and IP Range Summary.ASN: 21633 - U.S. Department of the InteriorHost Count: 2046Addressable IPs: 2048137.227.96.0/24137.227.97.0/24137.227.98.0/24137.227.99.0/24137.227.100.0/24137.227.101.0/24137.227.102.0/24137.227.103.0/24