AS17821 61.45.248.0/21 CIDR and IP Range Summary.ASN: 17821 - TWO-BYTE AS Number for APNIC Training LabHost Count: 2046Addressable IPs: 204861.45.248.0/2461.45.249.0/2461.45.250.0/2461.45.251.0/2461.45.252.0/2461.45.253.0/2461.45.254.0/2461.45.255.0/24