| 63.0.0.0/8 | WHOIS (ARIN) | American Registry for Internet Numbers | US |
| 63.250.128.0/18 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.128.0/18 | WHOIS (ARIN) | INFONET Services Corporation | US |
| 63.250.128.0/18 | ARIN assigned | — | US |
| 63.250.128.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.132.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.136.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.140.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.144.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.148.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.152.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.156.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.160.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.168.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.176.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.180.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.184.0/22 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.136.0/23 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.131.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.132.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.135.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.138.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.139.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.144.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.147.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.151.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.155.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.159.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.163.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.164.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.165.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.166.0/24 | WHOIS (ARIN) | WorleyParsons | US |
| 63.250.171.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.172.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.173.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.174.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.178.0/24 | WHOIS (ARIN) | British Telecom | US |
| 63.250.179.0/24 | WHOIS (ARIN) | British Telecom | US |
| 63.250.181.0/24 | WHOIS (ARIN) | British Telecom | US |
| 63.250.183.0/24 | WHOIS (ARIN) | British Telecom | US |
| 63.250.187.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.189.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.191.0/24 | BGP route | AS3300 British Telecommunications Limited | — |
| 63.250.147.128/25 | WHOIS (ARIN) | CNH INDUSTRIAL | BR |
| 63.250.158.0/25 | WHOIS (ARIN) | LG CNS CO. LTD | US |
| 63.250.159.128/25 | WHOIS (ARIN) | COTY | US |
| 63.250.177.0/25 | WHOIS (ARIN) | KARL STORZ GMBH AND CO. KG | US |
| 63.250.191.0/25 | WHOIS (ARIN) | DP DHL ETO | US |
| 63.250.139.128/26 | WHOIS (ARIN) | mainsoft | US |
| 63.250.147.64/26 | WHOIS (ARIN) | CNH INDUSTRIAL | BR |
| 63.250.159.64/26 | WHOIS (ARIN) | BT CUSTOMER | US |
| 63.250.185.64/26 | WHOIS (ARIN) | h muehlstein and co inc | US |
| 63.250.132.128/27 | WHOIS (ARIN) | DIGITPA | US |
| 63.250.133.128/27 | WHOIS (ARIN) | SCHINDLER HOLDING | US |
| 63.250.136.96/27 | WHOIS (ARIN) | BT/Unilever | SV |
| 63.250.137.96/27 | WHOIS (ARIN) | crystal decisions | US |
| 63.250.137.160/27 | WHOIS (ARIN) | tupperware/dt | VE |
| 63.250.139.0/27 | WHOIS (ARIN) | tupperware/dt | BR |
| 63.250.139.32/27 | WHOIS (ARIN) | Infonet | US |
| 63.250.139.64/27 | WHOIS (ARIN) | crystal decisions | CA |
| 63.250.139.192/27 | WHOIS (ARIN) | wilh wilhelmsen asa | US |
| 63.250.139.224/27 | WHOIS (ARIN) | mysticom | US |
| 63.250.152.128/27 | WHOIS (ARIN) | REED EXHIBITIONS | US |
| 63.250.155.192/27 | WHOIS (ARIN) | TRIVIUM PACKAGING BV | US |
| 63.250.176.32/27 | WHOIS (ARIN) | arthrocare | US |
| 63.250.180.160/27 | WHOIS (ARIN) | LUMILEDS HOLDING BV | US |
| 63.250.180.224/27 | WHOIS (ARIN) | BRISTOL-MYERS SQUIBB COMPANY INC | US |
| 63.250.182.128/27 | WHOIS (ARIN) | GRUNDFOS | US |
| 63.250.185.0/27 | WHOIS (ARIN) | qwest/dia | BR |
| 63.250.185.32/27 | WHOIS (ARIN) | Orbotech | US |
| 63.250.185.192/27 | WHOIS (ARIN) | netvision | US |
| 63.250.187.32/27 | WHOIS (ARIN) | MOTHERSON SUMI INFOTECH AND DESIGN LIMITED | US |
| 63.250.188.64/27 | WHOIS (ARIN) | Tecnomen Oyj | BR |
| 63.250.188.128/27 | WHOIS (ARIN) | GE Transport/GE Elano Canada | CA |
| 63.250.188.224/27 | WHOIS (ARIN) | GE Consumer Finance | CA |
| 63.250.128.128/28 | WHOIS (ARIN) | BT Phoenix | GB |
| 63.250.128.144/28 | WHOIS (ARIN) | Medimmune | US |
| 63.250.128.176/28 | WHOIS (ARIN) | SCHINDLER HOLDING | US |
| 63.250.128.192/28 | WHOIS (ARIN) | PHOENIX | US |
| 63.250.128.208/28 | WHOIS (ARIN) | Katoen Natie | US |
| 63.250.128.240/28 | WHOIS (ARIN) | SCHINDLER HOLDING | US |
| 63.250.129.128/28 | WHOIS (ARIN) | FIAT GROUP | US |
| 63.250.130.16/28 | WHOIS (ARIN) | BT INFRASTRUCTURE PHOENIX | US |
| 63.250.130.96/28 | WHOIS (ARIN) | BT INFRASTRUCTURE PHEONIX | US |
| 63.250.130.192/28 | WHOIS (ARIN) | BTIO | US |
| 63.250.131.48/28 | WHOIS (ARIN) | SCHINDLER HOLDING | US |