| 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. | — |
| 203.150.128.0/17 | WHOIS (APNIC) | Internet Thailand Company Ltd. | TH |
| 203.150.128.0/17 | APNIC assigned | — | TH |
| 203.150.128.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.160.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.192.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.128.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.128.0/20 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.144.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.160.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.160.0/20 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.176.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.176.0/20 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.192.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.208.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.224.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.240.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.128.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.144.0/21 | WHOIS (APNIC) | INET-TH | TH |
| 203.150.152.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.160.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.168.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.232.0/21 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.136.0/22 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.152.0/22 | WHOIS (APNIC) | INET-TH | TH |
| 203.150.156.0/23 | WHOIS (APNIC) | INET-TH | TH |
| 203.150.208.0/23 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.224.0/23 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.224.0/23 | WHOIS (APNIC) | INET IDC HQ Vlan224 | TH |
| 203.150.230.0/23 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.230.0/23 | WHOIS (APNIC) | INET IDC HQ Vlan230 | TH |
| 203.150.238.0/23 | WHOIS (APNIC) | INET IDC Security zone | TH |
| 203.150.128.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.130.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.131.0/24 | BGP route | AS135381 Symphony Communication Public Company Limited | — |
| 203.150.137.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.138.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.139.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.140.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.141.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.144.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.146.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.146.0/24 | WHOIS (APNIC) | Customer of INET | TH |
| 203.150.147.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.148.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.149.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.152.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.153.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.154.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.155.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.156.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.157.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.158.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.158.0/24 | WHOIS (APNIC) | INET-TH | TH |
| 203.150.159.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.159.0/24 | WHOIS (APNIC) | INEXT Broadband Company Limited | TH |
| 203.150.160.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.161.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.162.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.163.0/24 | BGP route | AS55925 Bank for Agriculture and Agricultural Co-operative | — |
| 203.150.164.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.165.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.166.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.167.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.150.184.0/24 | WHOIS (APNIC) | Internet Thailand Company Ltd. | TH |
| 203.150.210.0/24 | WHOIS (APNIC) | INET Office TID Department | TH |
| 203.150.211.0/24 | WHOIS (APNIC) | INET Office IS Department | TH |
| 203.150.212.0/24 | WHOIS (APNIC) | INET Office TID Department | TH |
| 203.150.214.0/24 | WHOIS (APNIC) | INET IDC Service SLB | TH |
| 203.150.217.0/24 | WHOIS (APNIC) | INET Internal server | TH |
| 203.150.219.0/24 | WHOIS (APNIC) | INET VPN Office | TH |
| 203.150.220.0/24 | WHOIS (APNIC) | INET WAN Branch | TH |
| 203.150.226.0/24 | WHOIS (APNIC) | INET IDC HQ Vlan226 | TH |
| 203.150.227.0/24 | WHOIS (APNIC) | INET IDC HQ Vlan227 | TH |
| 203.150.228.0/24 | WHOIS (APNIC) | INET IDC HQ Vlan228 | TH |
| 203.150.229.0/24 | WHOIS (APNIC) | INET IDC HQ Vlan229 | TH |
| 203.150.240.0/24 | WHOIS (APNIC) | TA Orange Company Limited | TH |
| 203.150.244.0/24 | WHOIS (APNIC) | Internet Thailand Public Company Limited | TH |
| 203.150.199.128/25 | WHOIS (APNIC) | PSMT Company Limited | TH |
| 203.150.201.0/25 | WHOIS (APNIC) | Kurnia Insurance Company Limited | TH |
| 203.150.198.32/27 | WHOIS (APNIC) | Department of Special Investigation | TH |
| 203.150.200.64/27 | WHOIS (APNIC) | Acer Computer Co., Ltd. | TH |
| 203.150.200.96/27 | WHOIS (APNIC) | Logistech Distribution Services Ltd. | TH |
| 203.150.202.224/27 | WHOIS (APNIC) | Matichon Public Co.,Ltd. | TH |
| 203.150.206.64/27 | WHOIS (APNIC) | Bumrungrad Medical Center Company Limited. | TH |
| 203.150.206.96/27 | WHOIS (APNIC) | U-Freight (Thailand) Co.,Ltd. | TH |
| 203.150.206.160/27 | WHOIS (APNIC) | Glow Company Limited | TH |
| 203.150.213.32/27 | WHOIS (APNIC) | INET IDC Service SLB | TH |
| 203.150.218.0/27 | WHOIS (APNIC) | INET Wireless Guest Zone | TH |
| 203.150.234.128/27 | WHOIS (APNIC) | DBS Backup route | TH |
| 203.150.234.224/27 | WHOIS (APNIC) | Gulf Electric Public Co., Ltd. | TH |
| 203.150.235.128/27 | WHOIS (APNIC) | The Value Systems Co.,Ltd. | TH |
| 203.150.235.224/27 | WHOIS (APNIC) | Trinity Information Co., Ltd. | TH |
| 203.150.232.0/28 | WHOIS (APNIC) | Leisure Apparels Co., Ltd. | TH |
| 203.150.232.16/28 | WHOIS (APNIC) | Wireless Routing Center (Thailand) Co.,Ltd | TH |
| 203.150.232.32/28 | WHOIS (APNIC) | NSTDA Online Learning Project | TH |
| 203.150.232.64/28 | WHOIS (APNIC) | Kim Eng Securities (Thailand) PLC. | TH |
| 203.150.232.96/28 | WHOIS (APNIC) | TSFC Securities Limited. | TH |
| 203.150.233.96/28 | WHOIS (APNIC) | Siam Sindthorn Property Co.,Ltd. | TH |
| 203.150.233.160/28 | WHOIS (APNIC) | E IT Computing Co., Ltd. | TH |