| 121.0.0.0/8 | WHOIS (APNIC) | Asia Pacific Network Information Center, Pty. Ltd. | AU |
| 121.192.0.0/14 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.0.0/15 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.0.0/15 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.0.0/15 | WHOIS (APNIC) | China Education and Research Network | CN |
| 121.194.0.0/15 | APNIC assigned | — | CN |
| 121.192.0.0/16 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.0.0/16 | WHOIS (APNIC) | China Education and Research Network | CN |
| 121.192.0.0/16 | APNIC assigned | — | CN |
| 121.193.0.0/16 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.0.0/16 | WHOIS (APNIC) | China Education and Research Network | CN |
| 121.193.0.0/16 | APNIC assigned | — | CN |
| 121.192.192.0/18 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.160.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.160.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.192.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.224.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.32.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.128.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.192.0/19 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.64.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.64.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.80.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.128.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.192.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.224.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.0.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.16.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.32.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.48.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.64.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.96.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.112.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.144.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.176.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.16.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.96.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.160.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.224.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.195.240.0/20 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.16.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.144.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.208.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.240.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.248.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.80.0/21 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.4.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.24.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.32.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.36.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.40.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.44.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.56.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.192.60.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.193.96.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.88.0/22 | BGP route | AS4538 China Education and Research Network Center | — |
| 121.194.92.0/22 | BGP route | AS4538 China Education and Research Network Center | — |