| 204.0.0.0/8 | WHOIS (ARIN) | American Registry for Internet Numbers | US |
| 204.248.0.0/14 | BGP route | AS174 Cogent Communications, LLC | — |
| 204.248.0.0/14 | WHOIS (ARIN) | Cogent Communications, LLC | US |
| 204.248.0.0/14 | ARIN assigned | — | US |
| 204.248.48.0/20 | WHOIS (ARIN) | Xnet Information Systems | US |
| 204.248.112.0/20 | BGP route | AS14828 Hiawatha Broadband Communications, Inc | — |
| 204.248.112.0/20 | WHOIS (ARIN) | Hiawatha Broadband Communications, Inc | US |
| 204.249.32.0/20 | BGP route | AS4133 Bitwise Internet Technologies, Inc. | — |
| 204.249.32.0/20 | WHOIS (ARIN) | Bitwise Internet Technologies | US |
| 204.249.192.0/20 | BGP route | AS8025 BrightNet Oklahoma | — |
| 204.249.192.0/20 | WHOIS (ARIN) | Chickasaw Telecommunications Services, Inc. | US |
| 204.250.96.0/20 | BGP route | AS3734 Santa Clara County Office of Education | — |
| 204.250.96.0/20 | WHOIS (ARIN) | Santa Clara County Office of Education | US |
| 204.249.64.0/21 | BGP route | AS29968 Dunkirk & Fredonia Telephone Company | — |
| 204.249.64.0/21 | WHOIS (ARIN) | Dunkirk & Fredonia Telephone Company | US |
| 204.249.240.0/21 | BGP route | AS6062 NETPLEX | — |
| 204.250.80.0/21 | BGP route | AS11924 Montana Opticom, LLC | — |
| 204.250.80.0/21 | WHOIS (ARIN) | Bridge Band Communications/At | US |
| 204.249.124.0/22 | BGP route | AS209 CenturyLink Communications, LLC | — |
| 204.251.32.0/22 | BGP route | AS2933 Real/Time Communications | — |
| 204.251.32.0/22 | WHOIS (ARIN) | Real/Time Communications | US |
| 204.251.252.0/22 | WHOIS (ARIN) | Southwest Texas Telephone Company | US |
| 204.249.64.0/23 | BGP route | AS29968 Dunkirk & Fredonia Telephone Company | — |
| 204.249.66.0/23 | BGP route | AS29968 Dunkirk & Fredonia Telephone Company | — |
| 204.249.68.0/23 | BGP route | AS29968 Dunkirk & Fredonia Telephone Company | — |
| 204.249.70.0/23 | BGP route | AS29968 Dunkirk & Fredonia Telephone Company | — |
| 204.249.104.0/23 | BGP route | AS6062 NETPLEX | — |
| 204.249.236.0/23 | WHOIS (ARIN) | WorldPath Internet Services | US |
| 204.249.238.0/23 | BGP route | AS21547 FirstLight Networks, LLC | — |
| 204.250.84.0/23 | BGP route | AS11924 Montana Opticom, LLC | — |
| 204.250.86.0/23 | BGP route | AS11924 Montana Opticom, LLC | — |
| 204.250.250.0/23 | BGP route | AS54239 BLOOMINGDALE HOME TELEPHONE COMPANY, INC | — |
| 204.250.250.0/23 | WHOIS (ARIN) | BLOOMINGDALE TELEPHONE INC | US |
| 204.251.218.0/23 | WHOIS (ARIN) | WHEATLAND ELECTRIC COOPERATIVE, INC | US |
| 204.248.0.0/24 | BGP route | AS22713 Credit Acceptance Corporation | — |
| 204.248.0.0/24 | WHOIS (ARIN) | CREDIT ACCEPTANCE CORP. | — |
| 204.248.157.0/24 | BGP route | AS11403 NYI | — |
| 204.248.157.0/24 | WHOIS (ARIN) | The New York Internet Company | US |
| 204.248.168.0/24 | BGP route | AS17046 Action Communications, Inc. | — |
| 204.249.180.0/24 | BGP route | AS400471 WHEATLAND ELECTRIC COOPERATIVE, INC | — |
| 204.249.180.0/24 | WHOIS (ARIN) | WHEATLAND ELECTRIC COOPERATIVE, INC | US |
| 204.250.24.0/24 | BGP route | AS18632 Volcano Vision, Inc. | — |
| 204.250.24.0/24 | WHOIS (ARIN) | Volcano Telephone | US |
| 204.250.82.0/24 | BGP route | AS11924 Montana Opticom, LLC | — |
| 204.250.83.0/24 | BGP route | AS11924 Montana Opticom, LLC | — |
| 204.250.119.0/24 | WHOIS (ARIN) | BCD Travel | US |
| 204.250.122.0/24 | WHOIS (ARIN) | Envoy Corporation | US |
| 204.250.123.0/24 | WHOIS (ARIN) | Cogent software, Inc. | US |
| 204.250.160.0/24 | BGP route | AS174 Cogent Communications, LLC | — |
| 204.251.175.0/24 | BGP route | AS22903 Databank Holdings, Ltd | — |
| 204.251.175.0/24 | WHOIS (ARIN) | Myers and Stauffer LC | US |
| 204.251.218.0/24 | BGP route | AS400471 WHEATLAND ELECTRIC COOPERATIVE, INC | — |
| 204.251.219.0/24 | BGP route | AS400471 WHEATLAND ELECTRIC COOPERATIVE, INC | — |
| 204.251.230.0/24 | BGP route | AS20325 Patelco Credit Union | — |
| 204.251.230.0/24 | WHOIS (ARIN) | Patelco Credit Union | US |
| 204.251.255.0/24 | BGP route | AS46853 Southwest Texas Communications | — |
| 204.248.83.64/26 | WHOIS (ARIN) | Cumberland County | US |
| 204.249.124.64/26 | WHOIS (ARIN) | ManTech Telecommunications & Information Systems | US |
| 204.249.181.0/26 | WHOIS (ARIN) | WHEATLAND ELECTRIC COOPERATIVE, INC | US |
| 204.249.224.128/26 | WHOIS (ARIN) | A4 Health Systems, Inc. | US |
| 204.251.182.0/26 | WHOIS (ARIN) | INTERTEC PUBLISHING CORPORATION | US |
| 204.248.83.192/27 | WHOIS (ARIN) | INTERTEL/SUN SUPPLY | US |
| 204.249.106.224/27 | WHOIS (ARIN) | Nachi American Inc. | US |
| 204.249.121.16/28 | WHOIS (ARIN) | NETCOM SYSTEMS | US |
| 204.249.124.0/28 | WHOIS (ARIN) | T&T Group | US |
| 204.249.224.192/28 | WHOIS (ARIN) | STOPS Inc | US |
| 204.250.75.0/28 | WHOIS (ARIN) | Synopsys Inc. | US |
| 204.251.16.64/28 | WHOIS (ARIN) | JDA Software, Inc. | US |
| 204.248.45.0/29 | WHOIS (ARIN) | Intertel-0636/Dominick Fletcher Yielding Wood & Lloyd-IP | US |
| 204.248.45.8/29 | WHOIS (ARIN) | Scientific Games | US |
| 204.248.88.8/29 | WHOIS (ARIN) | NORTHWEST COMMUNITY ACTION | US |
| 204.249.124.16/29 | WHOIS (ARIN) | R B Machine Works | US |
| 204.251.16.104/29 | WHOIS (ARIN) | EMBQ Wilson Community Health | US |
| 204.251.182.88/29 | WHOIS (ARIN) | Simpson Manufacturing | US |
| 204.249.176.22/32 | WHOIS (ARIN) | Ipsos America Inc | GT |