AS37557 168.253.16.0/21 CIDR and IP Range Summary.ASN: 37557 - Novafone-LRHost Count: 2046Addressable IPs: 2048168.253.16.0/24168.253.17.0/24168.253.18.0/24168.253.19.0/24168.253.20.0/24168.253.21.0/24168.253.22.0/24168.253.23.0/24