AS23528 147.253.208.0/20 CIDR and IP Range Summary.ASN: 23528 - SparkpostHost Count: 4094Addressable IPs: 4096147.253.208.0/24147.253.209.0/24147.253.210.0/24147.253.211.0/24147.253.212.0/24147.253.213.0/24147.253.214.0/24147.253.215.0/24147.253.216.0/24147.253.217.0/24147.253.218.0/24147.253.219.0/24147.253.220.0/24147.253.221.0/24147.253.222.0/24147.253.223.0/24