AS5610 81.90.160.0/20 CIDR and IP Range Summary.ASN: 5610 - O2 Czech Republic A.S.Host Count: 4094Addressable IPs: 409681.90.160.0/2481.90.161.0/2481.90.162.0/2481.90.163.0/2481.90.164.0/2481.90.165.0/2481.90.166.0/2481.90.167.0/2481.90.168.0/2481.90.169.0/2481.90.170.0/2481.90.171.0/2481.90.172.0/2481.90.173.0/2481.90.174.0/2481.90.175.0/24