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| CIDR range | Maintainer | Description | Source |
|---|---|---|---|
| 27.110.0.0/20 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 27.110.16.0/22 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 27.110.20.0/23 | MAINT-AS10021 | Colt Technology Services Co., Ltd. | JPIRR |
| 38.210.238.0/24 | MAINT-AS174 | Route Registered for Cogent Communications Customer - Babylon Cloud S.r.l. | RADB |
| 46.28.184.0/24 | DE-COLT-MNT | syzygy Deutschland GmbH | RIPE |
| 46.37.111.0/24 | IPXO-MNT | None | RIPE |
| 46.37.111.0/24 | MAINT-AS834 | autogen | radb |
| 46.248.128.0/19 | COLT-MNT | COLT | RIPE |
| 46.249.97.0/24 | Parsun-MNT | None | RIPE |
| 57.133.0.0/16 | COLT-MNT | COLT Technology Services | RIPE |
| 58.0.0.0/16 | COLT-UK | COLT Technology Services | RIPE |
| 58.1.128.0/17 | COLT-UK | COLT Technology Services | RIPE |
| 62.23.0.0/16 | COLT-FR-MNT | FR-COLT-FRANCE | RIPE |
| 62.23.14.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.23.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.43.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.61.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.70.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.254.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.23.255.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 62.72.96.0/19 | AS12640-MNT | COLT-BE | RIPE |
| 62.84.192.0/19 | SE-COLT-MNT | COLT Internet backbone Sweden | RIPE |
| 62.96.0.0/16 | DE-COLT-MNT | COLT-DE | RIPE |
| 62.97.64.0/18 | COLT-ESPANA-MNT | COLT Espana Customer Networks | RIPE |
| 62.152.96.0/19 | COLT-IT-MNT | COLT Internet IT | RIPE |
| 62.192.0.0/19 | COLT-CH-MNT | COLT Internet CH | RIPE |
| 64.137.12.0/23 | MAINT-AS398465 | Rackdog | RADB |
| 64.137.20.0/23 | MAINT-AS398465 | Rackdog | RADB |
| 64.137.24.0/22 | MAINT-AS398465 | Rackdog | RADB |
| 77.74.158.0/23 | MNT-CEAC | None | RIPE |
| 78.143.0.0/18 | COLT-MNT | COLT Technology Services | RIPE |
| 78.156.64.0/19 | COLT-MNT | COLT Technology Services | RIPE |
| 78.156.64.0/20 | COLT-MNT | COLT Technology Services | RIPE |
| 78.156.80.0/21 | COLT-MNT | COLT Technology Services | RIPE |
| 80.80.0.0/19 | COLT-DK-MNT | COLT Internet backbone Denmark | RIPE |
| 80.169.0.0/16 | COLT-UK | COLT | RIPE |
| 80.251.160.0/19 | COLT-ESPANA-MNT | COLT Internet Portugal | RIPE |
| 82.112.192.0/19 | COLT-IT-MNT | COLT Internet IT | RIPE |
| 84.14.0.0/16 | COLT-FR-MNT | FR-COLT-INTERNET-84-14 | RIPE |
| 84.14.63.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 84.14.217.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 84.16.160.0/19 | COLT-DK-MNT | COLT Telecom A/S | RIPE |
| 85.88.128.0/19 | COLT-MNT | COLT Internet Portugal | RIPE |
| 87.241.0.0/18 | COLT-IT-MNT | COLT Internet IT | RIPE |
| 90.152.0.0/18 | COLT-UK | Regus Management Limited | RIPE |
| 90.152.64.0/18 | COLT-UK | Regus Management Limited | RIPE |
| 90.152.64.0/19 | COLT-UK | Regus | RIPE |
| 90.152.96.0/19 | COLT-UK | Regus | RIPE |
| 91.124.19.0/24 | IPXO-MNT | None | RIPE |
| 91.124.19.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.20.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.20.0/24 | IPXO-MNT | None | RIPE |
| 91.124.21.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.21.0/24 | IPXO-MNT | None | RIPE |
| 91.124.22.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.22.0/24 | IPXO-MNT | None | RIPE |
| 91.124.23.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.23.0/24 | IPXO-MNT | None | RIPE |
| 91.124.40.0/24 | IPXO-MNT | None | RIPE |
| 91.124.40.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.41.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.41.0/24 | IPXO-MNT | None | RIPE |
| 91.124.42.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.42.0/24 | IPXO-MNT | None | RIPE |
| 91.124.43.0/24 | IPXO-MNT | None | RIPE |
| 91.124.43.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.44.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.44.0/24 | IPXO-MNT | None | RIPE |
| 91.124.45.0/24 | IPXO-MNT | None | RIPE |
| 91.124.45.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.46.0/24 | IPXO-MNT | None | RIPE |
| 91.124.46.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.47.0/24 | MAINT-AS834 | autogen | radb |
| 91.124.47.0/24 | IPXO-MNT | None | RIPE |
| 91.212.43.0/24 | COLT-CH-MNT | FIS-Global-Trading | RIPE |
| 91.240.166.0/23 | CARIPARMA-MNT | None | RIPE |
| 95.175.192.0/20 | COLT-UK | Regus Management Limited | RIPE |
| 95.175.208.0/20 | COLT-UK | Regus Management Limited | RIPE |
| 103.138.100.0/22 | MAINT-DIGIAGRALLC-JP | Digiagra, LLC. | APNIC |
| 103.248.76.0/24 | MAINT-QSL-HK | QUINTRON SYSTEMS LIMITED | APNIC |
| 109.75.100.0/22 | DE-COLT-MNT | WiSoTEL | RIPE |
| 109.75.105.0/24 | DE-COLT-MNT | WiSoTEL | RIPE |
| 110.50.78.0/23 | MAINT-AS10021 | Colt Technology Services Co., Ltd. | JPIRR |
| 116.83.0.0/17 | COLT-UK | COLT Technology Services | RIPE |
| 118.67.224.0/19 | COLT-UK | COLT-UK | RIPE |
| 129.41.90.0/24 | MAINT-AS8220 | proxy object for customer to build route filter | RADB |
| 136.225.0.0/16 | COLT-MNT | COLT Technology Services | RIPE |
| 139.181.48.0/24 | MNT-SIS-377 | Siemens Digital Industries Software Ltd | ARIN |
| 144.211.198.0/24 | MAINT-AS8220 | proxy object for customer to build route filter | RADB |
| 148.109.0.0/16 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 148.109.25.0/24 | MAINT-CTSCL-JP | TATA IZO | APNIC |
| 149.51.150.0/23 | MAINT-AS398465 | Rackdog Route | RADB |
| 153.96.140.0/24 | DE-COLT-MNT | Frauenhofer LUK-Gruppe | RIPE |
| 153.96.141.0/24 | DE-COLT-MNT | COLT | RIPE |
| 154.16.213.0/24 | MAINT-AS834 | autogen | radb |
| 154.16.218.0/24 | MAINT-AS834 | autogen | radb |
| 154.16.225.0/24 | MAINT-AS834 | autogen | radb |
| 154.16.231.0/24 | MAINT-AS834 | autogen | radb |
| 155.45.128.0/24 | SBS-MNT | used for Atos INAC in Singapore (new from Oktber 2020 via COLT formerly PACNET) | RIPE |
| 157.120.224.0/21 | COLT-UK | COLT Hongkong | RIPE |
| 157.120.236.0/22 | COLT-MNT | COLT-20140310 | RIPE |
| 157.120.240.0/20 | COLT-UK | COLT ASIA | RIPE |
| 158.162.32.0/19 | AS1930-MNT | None | RIPE |
| 158.162.192.0/18 | COLT-ESPANA-MNT | UCP | RIPE |
| 178.159.176.0/20 | COLT-UK | COLT Technology Services | RIPE |
| 185.8.84.0/23 | DE-COLT-MNT | wisotel | RIPE |
| 185.8.141.0/24 | COLT-ESPANA-MNT | eDreams International Network | RIPE |
| 185.65.196.0/23 | DE-COLT-MNT | WiSoTEL TeniTEL GmbH | RIPE |
| 185.95.240.0/22 | it-bankadati-1-mnt | None | RIPE |
| 185.138.136.0/22 | DE-COLT-MNT | Hailer | RIPE |
| 185.157.227.0/24 | COLT-UK | temp routing for 6DG | RIPE |
| 185.194.232.0/23 | ALPHALINK-MNT | Global route to ASII | RIPE |
| 185.247.126.0/24 | COLT-ESPANA-MNT | PASARELA ILUMINACION S.L. | RIPE |
| 192.51.54.0/24 | MAINT-AS8220 | MATHEMATiCAL SYSTEMS iNSTiTUTE iNC. | RADB |
| 192.103.52.0/24 | MAINT-AS8220 | proxy object for customer Windriver to build route filter | RADB |
| 192.109.56.0/24 | EASYNET-DE-MNT | TuTech Innovation GmbH | RIPE |
| 192.187.137.0/24 | MNT-KA-105 | Added Colt AS number 6/29/22 | ARIN |
| 192.231.17.0/24 | DE-COLT-MNT | KSP Kanzlei | RIPE |
| 193.16.48.0/20 | DE-COLT-MNT | Beru AG | RIPE |
| 193.16.48.0/21 | DE-COLT-MNT | Beru AG | RIPE |
| 193.16.56.0/22 | DE-COLT-MNT | Beru AG | RIPE |
| 193.16.60.0/23 | DE-COLT-MNT | Beru AG | RIPE |
| 193.16.62.0/24 | DE-COLT-MNT | Beru AG | RIPE |
| 193.16.155.0/24 | AS12878-MNT | Kofax Austria GmbH | RIPE |
| 193.16.241.0/24 | COLT-CH-MNT | GIVAUDAN | RIPE |
| 193.17.178.0/24 | COLT-MNT | Bemobile Vertriebs GmbH | RIPE |
| 193.28.82.0/24 | DE-COLT-MNT | EBERSPAECHER | RIPE |
| 193.30.84.0/24 | DE-GOV-BDBOS-MNT | None | RIPE |
| 193.33.182.0/23 | AS12640-MNT | BlueBackup Belgium | RIPE |
| 193.34.226.0/24 | lir-ch-prismagroup-1-MNT | None | RIPE |
| 193.36.242.0/24 | COLT-UK | Allen and Overy | RIPE |
| 193.82.0.0/19 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 193.82.32.0/19 | COLT-UK | COLT UK | RIPE |
| 193.96.108.0/23 | DE-COLT-MNT | INPRO | RIPE |
| 193.98.156.0/24 | DE-COLT-MNT | PSI, Geschaeftsbereich GOW, Berlin | RIPE |
| 193.100.254.0/24 | DE-COLT-MNT | Philosys Software GmbH | RIPE |
| 193.102.132.0/24 | DE-COLT-MNT | PSI, Geschaeftsbereich PI, Berlin | RIPE |
| 193.111.24.0/23 | COLT-UK | Clifford Chance | RIPE |
| 193.114.160.0/19 | COLT-UK | UK-COLT-19940210 | RIPE |
| 193.116.128.0/19 | COLT-MNT | COLT-UK | RIPE |
| 193.118.224.0/19 | COLT-MNT | COLT-UK | RIPE |
| 193.134.159.0/24 | COLT-CH-MNT | Swiss National Insurance Company | RIPE |
| 193.141.139.0/24 | DE-COLT-MNT | NEC-SX | RIPE |
| 193.183.185.0/24 | SE-COLT-MNT | FrontCapital | RIPE |
| 193.228.0.0/24 | AS12878-MNT | CHEMSON | RIPE |
| 193.235.44.0/24 | RESILANS-MNT | Beckers Industrial Coatings AB | RIPE |
| 193.235.45.0/24 | RESILANS-MNT | Beckers Industrial Coatings AB | RIPE |
| 194.0.195.0/24 | COLT-UK | CertEurope | RIPE |
| 194.15.148.0/23 | IBH-MNT | Renesas Electronics Germany GmbH | RIPE |
| 194.76.2.0/23 | DE-COLT-MNT | Wurttembergische Gemeinde-Versicherung AG | RIPE |
| 194.76.4.0/22 | DE-COLT-MNT | Wuerttembergische Gemeinde Versicherung a.G. via Colt | RIPE |
| 194.113.246.0/24 | DE-COLT-MNT | GAI NetConsult GmbH, Berlin | RIPE |
| 194.115.212.0/22 | DE-COLT-MNT | PSI-AG, Geschaeftsbereich PS | RIPE |
| 194.127.228.0/24 | DE-COLT-MNT | DE-COLT-DMC | RIPE |
| 194.223.128.0/21 | COLT-UK | COLT UK | RIPE |
| 194.223.136.0/22 | COLT-UK | COLT UK | RIPE |
| 194.223.140.0/22 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 194.223.144.0/20 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 195.20.223.0/24 | COLT-UK | Agilisys Ltd | RIPE |
| 195.68.0.0/17 | COLT-FR-MNT | ImagiNET France | RIPE |
| 195.68.74.0/24 | COLT-FR-MNT | TATA IZO | RIPE |
| 195.78.50.0/23 | AS12640-MNT | COLT-BE | RIPE |
| 195.110.64.0/19 | COLT-UK | COLT | RIPE |
| 195.178.0.0/23 | DE-COLT-MNT | WISOTEL | RIPE |
| 195.234.34.0/24 | COLT-MNT | arvato mobile GmbH | RIPE |
| 195.234.180.0/24 | COLT-CH-MNT | SCOR Services Switzerland AG | RIPE |
| 195.245.247.0/24 | COLT-UK | GroupM | RIPE |
| 202.7.104.0/24 | MAINT-AS10021 | Colt Technology Services Co., Ltd. | JPIRR |
| 202.24.96.0/23 | MAINT-AS8220 | Nippon Information Industry Corp. | RADB |
| 202.24.98.0/23 | MAINT-AS8220 | Nippon Information Industry Corp. | RADB |
| 202.95.218.0/23 | MAINT-AS10021 | Colt Technology Services Co., Ltd. | JPIRR |
| 202.255.102.0/24 | MAINT-AS8220 | Mainichi Broadcasting System,Inc. | RADB |
| 208.85.76.0/24 | MAINT-AS8220 | proxy object for customer to build route filter | RADB |
| 212.0.96.0/19 | COLT-ESPANA-MNT | COLT Espana Customer Networks | RIPE |
| 212.23.224.0/19 | COLT-CH-MNT | COLT Internet CH | RIPE |
| 212.31.224.0/19 | COLT-IT-MNT | COLT Internet IT | RIPE |
| 212.35.96.0/19 | AS12640-MNT | COLT-BE | RIPE |
| 212.36.32.0/19 | COLT-UK | Regus Group Services Ltd | RIPE |
| 212.36.144.0/20 | COLT-UK | COLT-UK-LIR | RIPE |
| 212.36.160.0/20 | COLT-UK | COLT-UK-LIR | RIPE |
| 212.36.184.0/21 | COLT-UK | COLT-UK-LIR | RIPE |
| 212.74.64.0/24 | COLT-MNT | COLT Internal 1 | RIPE |
| 212.74.77.0/24 | COLT-MNT | COLT Internal 4 | RIPE |
| 212.74.78.0/24 | COLT-MNT | COLT Internal 5 | RIPE |
| 212.74.79.0/24 | COLT-MNT | COLT Internal 6 | RIPE |
| 212.78.160.0/19 | COLT-NL-MNT | COLT-NL | RIPE |
| 212.121.128.0/19 | DE-COLT-MNT | COLT-DE | RIPE |
| 212.123.192.0/18 | COLT-NL-MNT | COLT-NL | RIPE |
| 212.161.0.0/17 | COLT-UK | COLT | RIPE |
| 212.203.64.0/18 | COLT-CH-MNT | COLT Internet CH | RIPE |
| 213.27.128.0/17 | COLT-ESPANA-MNT | COLT Espana Customer Networks | RIPE |
| 213.41.0.0/17 | COLT-FR-MNT | FR-COLT-FRANCE | RIPE |
| 213.61.0.0/16 | DE-COLT-MNT | COLT-DE | RIPE |
| 213.86.0.0/16 | COLT-UK | COLT | RIPE |
| 213.164.0.0/19 | AS12878-MNT | COLT Austria | RIPE |
| 213.173.160.0/19 | COLT-CH-MNT | COLT Internet CH | RIPE |
| 213.185.160.0/19 | AS12878-MNT | COLT Austria | RIPE |
| 213.208.192.0/18 | COLT-NL-MNT | COLT-NL | RIPE |
| 213.215.128.0/17 | COLT-IT-MNT | COLT Internet IT | RIPE |
| 213.229.128.0/18 | COLT-ESPANA-MNT | COLT Espana Customer Networks | RIPE |
| 213.246.192.0/18 | AS12640-MNT | COLT-BE | RIPE |
| 216.165.88.0/24 | MAINT-AS12 | New York University route object - advertised by Colt UK AS8220 | RADB |
| 217.110.0.0/15 | DE-COLT-MNT | COLT | RIPE |
| 217.173.96.0/20 | COLT-IE | COLT Internet Dublin | RIPE |
| 2001:678:274::/48 | DE-COLT-MNT | None | RIPE |
| 2001:678:868::/48 | DE-COLT-MNT | Media-press.tv (PPS) GMBH | RIPE |
| 2001:67c:424::/48 | DE-COLT-MNT | Wurttembergische Gemeinde-Versicherung AG | RIPE |
| 2001:67c:2b34::/48 | COLT-UK | None | RIPE |
| 2001:920::/32 | DE-COLT-MNT | COLT IPv6 network | RIPE |
| 2001:921::/32 | COLT-MNT | IPv6 Block EEU | RIPE |
| 2001:924::/32 | DE-COLT-MNT | COLT IPv6 network | RIPE |
| 2001:925::/32 | COLT-MNT | IPv6 Block for Australia, New Zealand | RIPE |
| 2001:926::/32 | COLT-MNT | COLT Asia IPv6 network | RIPE |
| 2001:926:40::/48 | COLT-UK | TATA IZO | RIPE |
| 2400:81e0::/32 | MAINT-CTSCL-JP | Colt Technology Services Co., Ltd. | APNIC |
| 2a06:6540:1000::/36 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6540:1001::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6540:1201::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6540:1241::/48 | ch-straumann-1-mnt | NL01 LAN | RIPE |
| 2a06:6540:1440::/48 | ch-straumann-1-mnt | RO01 LAN | RIPE |
| 2a06:6540:4101::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6540:4181::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6541:1000::/36 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6541:1001::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6541:1201::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6541:1241::/48 | ch-straumann-1-mnt | NL01 DMZ | RIPE |
| 2a06:6541:1440::/48 | ch-straumann-1-mnt | RO01 DMZ | RIPE |
| 2a06:6541:4101::/48 | ch-straumann-1-mnt | None | RIPE |
| 2a06:6541:4181::/48 | ch-straumann-1-mnt | None | RIPE |