| 203.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 203.72.0.0/14 | WHOIS (APNIC) | Taiwan Network Information Center | TW |
| 203.72.0.0/15 | APNIC assigned | — | TW |
| 203.74.0.0/15 | APNIC assigned | — | TW |
| 203.72.0.0/16 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.72.0.0/16 | WHOIS (APNIC) | Taiwan Academic Network | TW |
| 203.73.0.0/16 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.0.0/16 | WHOIS (APNIC) | Digital United Inc. | TW |
| 203.74.0.0/16 | BGP route | AS3462 Chunghwa Telecom Co., Ltd. | — |
| 203.74.0.0/16 | WHOIS (APNIC) | Data Communication Business Group, | TW |
| 203.75.0.0/16 | BGP route | AS3462 Chunghwa Telecom Co., Ltd. | — |
| 203.75.0.0/16 | WHOIS (APNIC) | Data Communication Business Group, | TW |
| 203.73.0.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.64.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.128.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.192.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.0.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.32.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.64.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.96.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.128.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.160.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.192.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.224.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.72.0.0/21 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.73.3.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.21.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.25.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.62.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.64.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.83.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.94.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.96.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.106.0/24 | BGP route | AS9919 New Century InfoComm Tech Co., Ltd. | — |
| 203.73.108.0/24 | BGP route | AS9919 New Century InfoComm Tech Co., Ltd. | — |
| 203.73.110.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.112.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.131.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.156.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.157.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.169.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.217.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.226.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.234.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.238.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.73.240.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.74.95.0/24 | BGP route | AS20940 Akamai International B.V. | — |
| 203.74.220.0/24 | BGP route | AS131660 Data Communication Business Group, | — |
| 203.74.221.0/24 | BGP route | AS131660 Data Communication Business Group, | — |
| 203.74.222.0/24 | BGP route | AS131660 Data Communication Business Group, | — |