AS43542 78.156.144.0/20 CIDR and IP Range Summary.ASN: 43542 - Optonet Communication Spol. S.R.O.Host Count: 4094Addressable IPs: 409678.156.144.0/2478.156.145.0/2478.156.146.0/2478.156.147.0/2478.156.148.0/2478.156.149.0/2478.156.150.0/2478.156.151.0/2478.156.152.0/2478.156.153.0/2478.156.154.0/2478.156.155.0/2478.156.156.0/2478.156.157.0/2478.156.158.0/2478.156.159.0/24