AS18031 117.16.40.0/21 CIDR and IP Range Summary.ASN: 18031 - Sangmyung UniversityHost Count: 2046Addressable IPs: 2048117.16.40.0/24117.16.41.0/24117.16.42.0/24117.16.43.0/24117.16.44.0/24117.16.45.0/24117.16.46.0/24117.16.47.0/24