Les adresses IP débutant par 21.91.77 sont fournies par China Education and Research Network Center, elles appartiennent au CIDR (Classless Inter-Domain Routing) 22.30.204.0/23, le bloc IP comprant les adresses de 22.30.204.0 à 22.30.205.255). Le numéro de système autonome (ASN) est 4538.
| ASN | 4538 |
| IP commençant par | 22.30.204.0 |
| IP se terminant par | 22.30.205.255 |
| Nom ASN | China Education and Research Network Center |
| CDIR | 22.30.204.0/23 |
| IP numérique | |
| Registe | |
| Dernière mise à jour | 18/08/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | US | États-Unis | - | Columbus | 39,9664 | -83,0128 | 2017-08-17 |
| MaxMind | US | États-Unis | - | - | 37,751 | -97,822 | 2017-08-17 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.91.77.0 | 358305024 | 0 |
| 21.91.77.1 | 358305025 | 0 |
| 21.91.77.2 | 358305026 | 0 |
| 21.91.77.3 | 358305027 | 0 |
| 21.91.77.4 | 358305028 | 0 |
| 21.91.77.5 | 358305029 | 0 |
| 21.91.77.6 | 358305030 | 0 |
| 21.91.77.7 | 358305031 | 0 |
| 21.91.77.8 | 358305032 | 0 |
| 21.91.77.9 | 358305033 | 0 |
| 21.91.77.10 | 358305034 | 0 |
| 21.91.77.11 | 358305035 | 0 |
| 21.91.77.12 | 358305036 | 0 |
| 21.91.77.13 | 358305037 | 0 |
| 21.91.77.14 | 358305038 | 0 |
| 21.91.77.15 | 358305039 | 0 |
| 21.91.77.16 | 358305040 | 0 |
| 21.91.77.17 | 358305041 | 0 |
| 21.91.77.18 | 358305042 | 0 |
| 21.91.77.19 | 358305043 | 0 |
| 21.91.77.20 | 358305044 | 0 |
| 21.91.77.21 | 358305045 | 0 |
| 21.91.77.22 | 358305046 | 0 |
| 21.91.77.23 | 358305047 | 0 |
| 21.91.77.24 | 358305048 | 0 |
| 21.91.77.25 | 358305049 | 0 |
| 21.91.77.26 | 358305050 | 0 |
| 21.91.77.27 | 358305051 | 0 |
| 21.91.77.28 | 358305052 | 0 |
| 21.91.77.29 | 358305053 | 0 |
| 21.91.77.30 | 358305054 | 0 |
| 21.91.77.31 | 358305055 | 0 |
| 21.91.77.32 | 358305056 | 0 |
| 21.91.77.33 | 358305057 | 0 |
| 21.91.77.34 | 358305058 | 0 |
| 21.91.77.35 | 358305059 | 0 |
| 21.91.77.36 | 358305060 | 0 |
| 21.91.77.37 | 358305061 | 0 |
| 21.91.77.38 | 358305062 | 0 |
| 21.91.77.39 | 358305063 | 0 |
| 21.91.77.40 | 358305064 | 0 |
| 21.91.77.41 | 358305065 | 0 |
| 21.91.77.42 | 358305066 | 0 |
| 21.91.77.43 | 358305067 | 0 |
| 21.91.77.44 | 358305068 | 0 |
| 21.91.77.45 | 358305069 | 0 |
| 21.91.77.46 | 358305070 | 0 |
| 21.91.77.47 | 358305071 | 0 |
| 21.91.77.48 | 358305072 | 0 |
| 21.91.77.49 | 358305073 | 0 |
| 21.91.77.50 | 358305074 | 0 |
| 21.91.77.51 | 358305075 | 0 |
| 21.91.77.52 | 358305076 | 0 |
| 21.91.77.53 | 358305077 | 0 |
| 21.91.77.54 | 358305078 | 0 |
| 21.91.77.55 | 358305079 | 0 |
| 21.91.77.56 | 358305080 | 0 |
| 21.91.77.57 | 358305081 | 0 |
| 21.91.77.58 | 358305082 | 0 |
| 21.91.77.59 | 358305083 | 0 |
| 21.91.77.60 | 358305084 | 0 |
| 21.91.77.61 | 358305085 | 0 |
| 21.91.77.62 | 358305086 | 0 |
| 21.91.77.63 | 358305087 | 0 |
| 21.91.77.64 | 358305088 | 0 |
| 21.91.77.65 | 358305089 | 0 |
| 21.91.77.66 | 358305090 | 0 |
| 21.91.77.67 | 358305091 | 0 |
| 21.91.77.68 | 358305092 | 0 |
| 21.91.77.69 | 358305093 | 0 |
| 21.91.77.70 | 358305094 | 0 |
| 21.91.77.71 | 358305095 | 0 |
| 21.91.77.72 | 358305096 | 0 |
| 21.91.77.73 | 358305097 | 0 |
| 21.91.77.74 | 358305098 | 0 |
| 21.91.77.75 | 358305099 | 0 |
| 21.91.77.76 | 358305100 | 0 |
| 21.91.77.77 | 358305101 | 0 |
| 21.91.77.78 | 358305102 | 0 |
| 21.91.77.79 | 358305103 | 0 |
| 21.91.77.80 | 358305104 | 0 |
| 21.91.77.81 | 358305105 | 0 |
| 21.91.77.82 | 358305106 | 0 |
| 21.91.77.83 | 358305107 | 0 |
| 21.91.77.84 | 358305108 | 0 |
| 21.91.77.85 | 358305109 | 0 |