| 203.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 203.249.0.0/17 | BGP route | AS4766 Korea Telecom | — |
| 203.249.0.0/18 | WHOIS (APNIC) | Korean Education Network | KR |
| 203.249.0.0/18 | APNIC assigned | — | KR |
| 203.249.0.0/19 | BGP route | AS4766 Korea Telecom | — |
| 203.249.64.0/19 | WHOIS (APNIC) | HONGIK UNIVERSITY | KR |
| 203.249.64.0/19 | APNIC assigned | — | KR |
| 203.249.96.0/19 | WHOIS (APNIC) | Korean Education Network | KR |
| 203.249.96.0/19 | APNIC assigned | — | KR |
| 203.249.48.0/20 | BGP route | AS9271 Wonkwang University | — |
| 203.249.64.0/20 | BGP route | AS18330 HONGIK UNIVERSITY | — |
| 203.249.96.0/20 | BGP route | AS9978 The University of Seoul | — |
| 203.249.80.0/22 | BGP route | AS18330 HONGIK UNIVERSITY | — |
| 203.249.116.0/22 | BGP route | AS9523 Mokwon University | — |
| 203.249.114.0/23 | BGP route | AS9523 Mokwon University | — |
| 203.249.124.0/23 | BGP route | AS4766 Korea Telecom | — |
| 203.249.11.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.12.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.13.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.14.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.15.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.16.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.32.0/24 | BGP route | AS4766 Korea Telecom | — |
| 203.249.33.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.34.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.35.0/24 | BGP route | AS9867 VISION College of Jeonju | — |
| 203.249.36.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.37.0/24 | BGP route | AS3786 LG DACOM Corporation | — |
| 203.249.38.0/24 | BGP route | AS55611 kyungmin university | — |
| 203.249.39.0/24 | BGP route | AS3786 LG DACOM Corporation | — |
| 203.249.40.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.41.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.42.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.43.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.44.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.45.0/24 | BGP route | AS10073 Korea National Open University | — |
| 203.249.47.0/24 | BGP route | AS10071 anyang University | — |
| 203.249.84.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.85.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.86.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.87.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.88.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.89.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.90.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.91.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.92.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.93.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.94.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.95.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.112.0/24 | BGP route | AS55621 Jeonju National University Of Education | — |
| 203.249.113.0/24 | BGP route | AS55621 Jeonju National University Of Education | — |
| 203.249.122.0/24 | BGP route | AS3786 LG DACOM Corporation | — |
| 203.249.123.0/24 | BGP route | AS3786 LG DACOM Corporation | — |
| 203.249.126.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |
| 203.249.127.0/24 | BGP route | AS9318 SK Broadband Co Ltd | — |