Les adresses IP débutant par 21.87.74 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 | 10/08/2017 |

| Code pays | Pays | Région | Ville | Latitude | Longitude | Dernière mise à jour | |
| IP2Location | US | États-Unis | - | Columbus | 39,9664 | -83,0128 | 2017-08-10 |
| MaxMind | US | États-Unis | - | - | 37,751 | -97,822 | 2017-08-10 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.87.74.0 | 358042112 | 0 |
| 21.87.74.1 | 358042113 | 0 |
| 21.87.74.2 | 358042114 | 0 |
| 21.87.74.3 | 358042115 | 0 |
| 21.87.74.4 | 358042116 | 0 |
| 21.87.74.5 | 358042117 | 0 |
| 21.87.74.6 | 358042118 | 0 |
| 21.87.74.7 | 358042119 | 0 |
| 21.87.74.8 | 358042120 | 0 |
| 21.87.74.9 | 358042121 | 0 |
| 21.87.74.10 | 358042122 | 0 |
| 21.87.74.11 | 358042123 | 0 |
| 21.87.74.12 | 358042124 | 0 |
| 21.87.74.13 | 358042125 | 0 |
| 21.87.74.14 | 358042126 | 0 |
| 21.87.74.15 | 358042127 | 0 |
| 21.87.74.16 | 358042128 | 0 |
| 21.87.74.17 | 358042129 | 0 |
| 21.87.74.18 | 358042130 | 0 |
| 21.87.74.19 | 358042131 | 0 |
| 21.87.74.20 | 358042132 | 0 |
| 21.87.74.21 | 358042133 | 0 |
| 21.87.74.22 | 358042134 | 0 |
| 21.87.74.23 | 358042135 | 0 |
| 21.87.74.24 | 358042136 | 0 |
| 21.87.74.25 | 358042137 | 0 |
| 21.87.74.26 | 358042138 | 0 |
| 21.87.74.27 | 358042139 | 0 |
| 21.87.74.28 | 358042140 | 0 |
| 21.87.74.29 | 358042141 | 0 |
| 21.87.74.30 | 358042142 | 0 |
| 21.87.74.31 | 358042143 | 0 |
| 21.87.74.32 | 358042144 | 0 |
| 21.87.74.33 | 358042145 | 0 |
| 21.87.74.34 | 358042146 | 0 |
| 21.87.74.35 | 358042147 | 0 |
| 21.87.74.36 | 358042148 | 0 |
| 21.87.74.37 | 358042149 | 0 |
| 21.87.74.38 | 358042150 | 0 |
| 21.87.74.39 | 358042151 | 0 |
| 21.87.74.40 | 358042152 | 0 |
| 21.87.74.41 | 358042153 | 0 |
| 21.87.74.42 | 358042154 | 0 |
| 21.87.74.43 | 358042155 | 0 |
| 21.87.74.44 | 358042156 | 0 |
| 21.87.74.45 | 358042157 | 0 |
| 21.87.74.46 | 358042158 | 0 |
| 21.87.74.47 | 358042159 | 0 |
| 21.87.74.48 | 358042160 | 0 |
| 21.87.74.49 | 358042161 | 0 |
| 21.87.74.50 | 358042162 | 0 |
| 21.87.74.51 | 358042163 | 0 |
| 21.87.74.52 | 358042164 | 0 |
| 21.87.74.53 | 358042165 | 0 |
| 21.87.74.54 | 358042166 | 0 |
| 21.87.74.55 | 358042167 | 0 |
| 21.87.74.56 | 358042168 | 0 |
| 21.87.74.57 | 358042169 | 0 |
| 21.87.74.58 | 358042170 | 0 |
| 21.87.74.59 | 358042171 | 0 |
| 21.87.74.60 | 358042172 | 0 |
| 21.87.74.61 | 358042173 | 0 |
| 21.87.74.62 | 358042174 | 0 |
| 21.87.74.63 | 358042175 | 0 |
| 21.87.74.64 | 358042176 | 0 |
| 21.87.74.65 | 358042177 | 0 |
| 21.87.74.66 | 358042178 | 0 |
| 21.87.74.67 | 358042179 | 0 |
| 21.87.74.68 | 358042180 | 0 |
| 21.87.74.69 | 358042181 | 0 |
| 21.87.74.70 | 358042182 | 0 |
| 21.87.74.71 | 358042183 | 0 |
| 21.87.74.72 | 358042184 | 0 |
| 21.87.74.73 | 358042185 | 0 |
| 21.87.74.74 | 358042186 | 0 |
| 21.87.74.75 | 358042187 | 0 |
| 21.87.74.76 | 358042188 | 0 |
| 21.87.74.77 | 358042189 | 0 |
| 21.87.74.78 | 358042190 | 0 |
| 21.87.74.79 | 358042191 | 0 |
| 21.87.74.80 | 358042192 | 0 |
| 21.87.74.81 | 358042193 | 0 |
| 21.87.74.82 | 358042194 | 0 |
| 21.87.74.83 | 358042195 | 0 |
| 21.87.74.84 | 358042196 | 0 |
| 21.87.74.85 | 358042197 | 0 |