AS3356 8.18.136.0/21 CIDR and IP Range Summary.ASN: 3356 - Level 3 Parent LLCHost Count: 2046Addressable IPs: 20488.18.136.0/248.18.137.0/248.18.138.0/248.18.139.0/248.18.140.0/248.18.141.0/248.18.142.0/248.18.143.0/24