| 204.0.0.0/8 | WHOIS (ARIN) | American Registry for Internet Numbers | US |
| 204.220.0.0/15 | BGP route | AS5006 Inteliquent, inc. | — |
| 204.220.0.0/15 | WHOIS (ARIN) | Inteliquent, inc. | US |
| 204.220.0.0/15 | ARIN assigned | — | US |
| 204.220.64.0/20 | WHOIS (ARIN) | Mailgun Technologies Inc. | US |
| 204.220.160.0/20 | WHOIS (ARIN) | Mailgun Technologies Inc. | US |
| 204.220.176.0/20 | WHOIS (ARIN) | Mailgun Technologies Inc. | US |
| 204.221.160.0/21 | BGP route | AS7821 Inteliquent, inc. | — |
| 204.221.160.0/21 | WHOIS (ARIN) | Interstate Telecom | US |
| 204.221.144.0/22 | BGP route | AS33362 Wikstrom Telephone Company, Incorporated | — |
| 204.221.144.0/22 | WHOIS (ARIN) | Wikstrom Telephone Company, Incorporated | US |
| 204.221.18.0/23 | BGP route | AS33362 Wikstrom Telephone Company, Incorporated | — |
| 204.221.18.0/23 | WHOIS (ARIN) | Wikstrom Telephone Company, Incorporated | US |
| 204.221.76.0/23 | WHOIS (ARIN) | Digi-Key Corporation | US |
| 204.221.148.0/23 | WHOIS (ARIN) | Blue Earth Valley Communications, Inc. | US |
| 204.220.52.0/24 | BGP route | AS5006 Inteliquent, inc. | — |
| 204.220.62.0/24 | BGP route | AS5006 Inteliquent, inc. | — |
| 204.220.64.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.90.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.91.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.92.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.94.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.95.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.152.0/24 | BGP route | AS5006 Inteliquent, inc. | — |
| 204.220.156.0/24 | BGP route | AS5006 Inteliquent, inc. | — |
| 204.220.160.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.161.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.162.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.163.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.164.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.165.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.166.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.167.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.168.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.169.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.170.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.171.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.172.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.173.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.174.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.175.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.176.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.177.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.220.178.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.179.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.180.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.181.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.182.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.183.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.184.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.186.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.187.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.188.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.189.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.220.190.0/24 | BGP route | AS396982 Google LLC | — |
| 204.220.191.0/24 | BGP route | AS396479 Mailgun Technologies Inc. | — |
| 204.221.12.0/24 | BGP route | AS200069 MAILJET SAS | — |
| 204.221.12.0/24 | WHOIS (ARIN) | Mailgun Technologies Inc. | US |
| 204.221.17.0/24 | BGP route | AS33362 Wikstrom Telephone Company, Incorporated | — |
| 204.221.17.0/24 | WHOIS (ARIN) | Wikstrom Telephone Company, Incorporated | US |
| 204.221.20.0/24 | BGP route | AS7821 Inteliquent, inc. | — |
| 204.221.20.0/24 | WHOIS (ARIN) | Interstate Telecom | US |
| 204.221.26.0/24 | BGP route | AS7821 Inteliquent, inc. | — |
| 204.221.26.0/24 | WHOIS (ARIN) | Interstate Telecomm Coop. | US |
| 204.221.76.0/24 | BGP route | AS14738 Digi-Key Corporation | — |
| 204.221.212.128/26 | WHOIS (ARIN) | Home Telephone Company | US |
| 204.221.193.160/27 | WHOIS (ARIN) | KIDS Analogue Network | US |
| 204.220.135.176/28 | WHOIS (ARIN) | American Baptist Homes | US |
| 204.220.157.64/28 | WHOIS (ARIN) | Avi Systems | US |
| 204.220.157.80/28 | WHOIS (ARIN) | Avi Systems | US |
| 204.221.37.136/29 | WHOIS (ARIN) | White Earth Tribal Health Services | US |
| 204.221.213.216/29 | WHOIS (ARIN) | River Towers | US |