| 203.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 203.64.0.0/14 | WHOIS (APNIC) | Taiwan Network Information Center | TW |
| 203.64.0.0/16 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.64.0.0/16 | WHOIS (APNIC) | Taiwan Academic Network | TW |
| 203.64.0.0/16 | APNIC assigned | — | TW |
| 203.66.0.0/16 | BGP route | AS3462 Chunghwa Telecom Co., Ltd. | — |
| 203.66.0.0/16 | WHOIS (APNIC) | Data Communication Business Group, | TW |
| 203.66.0.0/16 | APNIC assigned | — | TW |
| 203.67.0.0/16 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.0.0/16 | WHOIS (APNIC) | Digital United Inc. | TW |
| 203.67.0.0/16 | APNIC assigned | — | TW |
| 203.65.0.0/17 | BGP route | AS4782 Data Communication Business Group, | — |
| 203.65.0.0/17 | WHOIS (APNIC) | Ministry of Health and Welfare | TW |
| 203.65.0.0/17 | APNIC assigned | — | TW |
| 203.67.0.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.64.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.128.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.192.0/18 | BGP route | AS4780 Digital United Inc. | — |
| 203.65.128.0/19 | BGP route | AS4782 Data Communication Business Group, | — |
| 203.65.128.0/19 | WHOIS (APNIC) | Ministry of Health and Welfare | TW |
| 203.65.128.0/19 | APNIC assigned | — | TW |
| 203.65.160.0/19 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.65.160.0/19 | WHOIS (APNIC) | Global Communication Network Corp. | TW |
| 203.65.160.0/19 | APNIC assigned | — | TW |
| 203.65.192.0/19 | WHOIS (APNIC) | Acer Internet Services Inc. | TW |
| 203.65.192.0/19 | APNIC assigned | — | TW |
| 203.65.224.0/19 | WHOIS (APNIC) | TENG-FONG INTERNATIONAL CO., LTD. | TW |
| 203.65.224.0/19 | APNIC assigned | — | TW |
| 203.67.0.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.32.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.64.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.96.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.128.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.160.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.192.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.224.0/19 | BGP route | AS4780 Digital United Inc. | — |
| 203.65.192.0/20 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.65.208.0/20 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.64.8.0/21 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.64.120.0/21 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.64.128.0/21 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.65.224.0/22 | BGP route | AS7482 Asia Pacific On-Line Service Inc. | — |
| 203.65.240.0/22 | BGP route | AS4808 China Unicom | — |
| 203.64.207.0/24 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.64.238.0/24 | BGP route | AS1659 Taiwan Academic Network (TANet) Information Center | — |
| 203.65.0.0/24 | WHOIS (APNIC) | Taiwan Network Information Center | TW |
| 203.65.172.0/24 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.65.174.0/24 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.65.228.0/24 | BGP route | AS7482 Asia Pacific On-Line Service Inc. | — |
| 203.65.229.0/24 | BGP route | AS7482 Asia Pacific On-Line Service Inc. | — |
| 203.65.230.0/24 | BGP route | AS7482 Asia Pacific On-Line Service Inc. | — |
| 203.65.231.0/24 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.65.232.0/24 | BGP route | AS9924 Taiwan Fixed Network, Telco and Network Service Provider. | — |
| 203.66.100.0/24 | BGP route | AS23675 Taiwan Semiconductor Manufacturing Company, Ltd. | — |
| 203.66.101.0/24 | BGP route | AS23675 Taiwan Semiconductor Manufacturing Company, Ltd. | — |
| 203.66.102.0/24 | BGP route | AS23675 Taiwan Semiconductor Manufacturing Company, Ltd. | — |
| 203.66.151.0/24 | BGP route | AS9678 HostingInside LTD | — |
| 203.66.245.0/24 | BGP route | AS23675 Taiwan Semiconductor Manufacturing Company, Ltd. | — |
| 203.67.9.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.38.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.58.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.68.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.156.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.170.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.171.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.172.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.174.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.176.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.67.183.0/24 | BGP route | AS4780 Digital United Inc. | — |
| 203.66.136.224/27 | WHOIS (APNIC) | Taipei Taiwan | TW |