| 203.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 203.154.0.0/16 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.0.0/16 | WHOIS (APNIC) | Internet Thailand Company Ltd. | TH |
| 203.154.128.0/18 | APNIC assigned | — | TH |
| 203.154.128.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.160.0/19 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.128.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.144.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.160.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.176.0/20 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.128.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.130.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.131.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.132.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.133.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.135.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.135.0/24 | WHOIS (APNIC) | Openland scape Company Limited | TH |
| 203.154.136.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.137.0/24 | BGP route | AS132063 KGI Securities (Thailand) Public Company Limited | — |
| 203.154.155.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.159.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.165.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.166.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.167.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.170.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.177.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.178.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.179.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.180.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.182.0/24 | WHOIS (APNIC) | Sheraton Grande Sukhumvit Hotel | TH |
| 203.154.183.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.184.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.185.0/24 | BGP route | AS4618 Internet Thailand Company Ltd. | — |
| 203.154.144.64/27 | WHOIS (APNIC) | Metrohom Ltd. Thailand | TH |
| 203.154.174.160/27 | WHOIS (APNIC) | CHIYODA INTEGRE (THAILAND) CO.,LTD | TH |
| 203.154.177.224/27 | WHOIS (APNIC) | Weatlh Mangement System Limited | TH |
| 203.154.178.0/27 | WHOIS (APNIC) | Department Of Land Transport | TH |
| 203.154.178.32/27 | WHOIS (APNIC) | Somdej Prapinklao Hospital | TH |
| 203.154.180.128/27 | WHOIS (APNIC) | Grande Asset Development Public Company Limited | TH |
| 203.154.186.64/27 | WHOIS (APNIC) | United Nations Office for Project Services | TH |
| 203.154.186.96/27 | WHOIS (APNIC) | Mariani Thailand Ltd. | TH |
| 203.154.186.128/27 | WHOIS (APNIC) | ISR-PATTAYA Co., Ltd. | TH |
| 203.154.187.128/27 | WHOIS (APNIC) | Siam CBS Jewelry Co., Ltd. | TH |
| 203.154.148.224/28 | WHOIS (APNIC) | Petronas Retail (Thailand) Co.,Ltd. | TH |
| 203.154.151.224/28 | WHOIS (APNIC) | Far East Securities Co.,Ltd. | TH |
| 203.154.176.0/29 | WHOIS (APNIC) | INET NAS ADSL for TRUE | TH |