| 203.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 203.150.0.0/16 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.0.0/17 | WHOIS (APNIC) | Internet Thailand Company Ltd. | TH |
| 203.150.0.0/17 | APNIC assigned | — | TH |
| 203.150.96.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.96.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.96.0/20 | WHOIS (APNIC) | Reserved for Broadband Plus | TH |
| 203.150.112.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.112.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.120.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.116.0/22 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.120.0/22 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.114.0/23 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.124.0/23 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.126.0/23 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.96.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.98.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.99.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.101.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.105.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.111.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.112.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.113.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.113.0/24 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.114.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.116.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.117.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.118.0/24 | BGP route | AS135381 Symphony Communication Public Company Limited | — |
| 203.150.120.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.121.0/24 | BGP route | AS135381 Symphony Communication Public Company Limited | — |
| 203.150.122.0/24 | BGP route | AS135381 Symphony Communication Public Company Limited | — |
| 203.150.123.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.124.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.125.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.126.0/24 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.128/25 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.0/25 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.64/26 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.128/26 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.32/27 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.192/27 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.16/28 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.224/28 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.8/29 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.240/29 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.4/30 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.248/30 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.2/31 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.252/31 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.112.1/32 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.127.254/32 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |