AS39138 31.172.16.0/21 CIDR and IP Range Summary.ASN: 39138 - rrbone GmbHHost Count: 2046Addressable IPs: 204831.172.16.0/2431.172.17.0/2431.172.18.0/2431.172.19.0/2431.172.20.0/2431.172.21.0/2431.172.22.0/2431.172.23.0/24