AS3356 4.21.0.0/20 CIDR and IP Range Summary.ASN: 3356 - Level 3 Parent LLCHost Count: 4094Addressable IPs: 40964.21.0.0/244.21.1.0/244.21.2.0/244.21.3.0/244.21.4.0/244.21.5.0/244.21.6.0/244.21.7.0/244.21.8.0/244.21.9.0/244.21.10.0/244.21.11.0/244.21.12.0/244.21.13.0/244.21.14.0/244.21.15.0/24