AS15817 31.220.120.0/21 CIDR and IP Range Summary.ASN: 15817 - Robert Meyer Trading As Mittwald CM Service GmbH & Co. KgHost Count: 2046Addressable IPs: 204831.220.120.0/2431.220.121.0/2431.220.122.0/2431.220.123.0/2431.220.124.0/2431.220.125.0/2431.220.126.0/2431.220.127.0/24