AS15644 5.61.64.0/21 CIDR and IP Range Summary.ASN: 15644 - Fresenius SE & Co. KGaAHost Count: 2046Addressable IPs: 20485.61.64.0/245.61.65.0/245.61.66.0/245.61.67.0/245.61.68.0/245.61.69.0/245.61.70.0/245.61.71.0/24