L'indirizzo IP 21.87.66 è fornito da China Education and Research Network Center, che è di proprietà del CIDR (Classless Inter-Domain Routing) 22.30.204.0/23, IP tra 22.30.204.0 a 22.30.205.255 ). Il numero di sistema autonomo (ASN) è 4538.
| ASN | 4538 |
| IP inizia con | 22.30.204.0 |
| IP finale con | 22.30.205.255 |
| ASN Nome | China Education and Research Network Center |
| CDIR | 22.30.204.0/23 |
| IP numerico | |
| Registe | |
| Ultimo aggiornamento | 09/07/2018 |

| Codice paese | Paese | Regione | Città | Latitude | Longitude | Ultimo aggiornamento | |
| IP2Location | US | United States | - | Houston | 29,7633 | -95,3633 | 2018-07-09 |
| MaxMind | US | United States | - | - | 37,751 | -97,822 | 2018-07-09 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.87.66.0 | 358040064 | 0 |
| 21.87.66.1 | 358040065 | 0 |
| 21.87.66.2 | 358040066 | 0 |
| 21.87.66.3 | 358040067 | 0 |
| 21.87.66.4 | 358040068 | 0 |
| 21.87.66.5 | 358040069 | 0 |
| 21.87.66.6 | 358040070 | 0 |
| 21.87.66.7 | 358040071 | 0 |
| 21.87.66.8 | 358040072 | 0 |
| 21.87.66.9 | 358040073 | 0 |
| 21.87.66.10 | 358040074 | 0 |
| 21.87.66.11 | 358040075 | 0 |
| 21.87.66.12 | 358040076 | 0 |
| 21.87.66.13 | 358040077 | 0 |
| 21.87.66.14 | 358040078 | 0 |
| 21.87.66.15 | 358040079 | 0 |
| 21.87.66.16 | 358040080 | 0 |
| 21.87.66.17 | 358040081 | 0 |
| 21.87.66.18 | 358040082 | 0 |
| 21.87.66.19 | 358040083 | 0 |
| 21.87.66.20 | 358040084 | 0 |
| 21.87.66.21 | 358040085 | 0 |
| 21.87.66.22 | 358040086 | 0 |
| 21.87.66.23 | 358040087 | 0 |
| 21.87.66.24 | 358040088 | 0 |
| 21.87.66.25 | 358040089 | 0 |
| 21.87.66.26 | 358040090 | 0 |
| 21.87.66.27 | 358040091 | 0 |
| 21.87.66.28 | 358040092 | 0 |
| 21.87.66.29 | 358040093 | 0 |
| 21.87.66.30 | 358040094 | 0 |
| 21.87.66.31 | 358040095 | 0 |
| 21.87.66.32 | 358040096 | 0 |
| 21.87.66.33 | 358040097 | 0 |
| 21.87.66.34 | 358040098 | 0 |
| 21.87.66.35 | 358040099 | 0 |
| 21.87.66.36 | 358040100 | 0 |
| 21.87.66.37 | 358040101 | 0 |
| 21.87.66.38 | 358040102 | 0 |
| 21.87.66.39 | 358040103 | 0 |
| 21.87.66.40 | 358040104 | 0 |
| 21.87.66.41 | 358040105 | 0 |
| 21.87.66.42 | 358040106 | 0 |
| 21.87.66.43 | 358040107 | 0 |
| 21.87.66.44 | 358040108 | 0 |
| 21.87.66.45 | 358040109 | 0 |
| 21.87.66.46 | 358040110 | 0 |
| 21.87.66.47 | 358040111 | 0 |
| 21.87.66.48 | 358040112 | 0 |
| 21.87.66.49 | 358040113 | 0 |
| 21.87.66.50 | 358040114 | 0 |
| 21.87.66.51 | 358040115 | 0 |
| 21.87.66.52 | 358040116 | 0 |
| 21.87.66.53 | 358040117 | 0 |
| 21.87.66.54 | 358040118 | 0 |
| 21.87.66.55 | 358040119 | 0 |
| 21.87.66.56 | 358040120 | 0 |
| 21.87.66.57 | 358040121 | 0 |
| 21.87.66.58 | 358040122 | 0 |
| 21.87.66.59 | 358040123 | 0 |
| 21.87.66.60 | 358040124 | 0 |
| 21.87.66.61 | 358040125 | 0 |
| 21.87.66.62 | 358040126 | 0 |
| 21.87.66.63 | 358040127 | 0 |
| 21.87.66.64 | 358040128 | 0 |
| 21.87.66.65 | 358040129 | 0 |
| 21.87.66.66 | 358040130 | 0 |
| 21.87.66.67 | 358040131 | 0 |
| 21.87.66.68 | 358040132 | 0 |
| 21.87.66.69 | 358040133 | 0 |
| 21.87.66.70 | 358040134 | 0 |
| 21.87.66.71 | 358040135 | 0 |
| 21.87.66.72 | 358040136 | 0 |
| 21.87.66.73 | 358040137 | 0 |
| 21.87.66.74 | 358040138 | 0 |
| 21.87.66.75 | 358040139 | 0 |
| 21.87.66.76 | 358040140 | 0 |
| 21.87.66.77 | 358040141 | 0 |
| 21.87.66.78 | 358040142 | 0 |
| 21.87.66.79 | 358040143 | 0 |
| 21.87.66.80 | 358040144 | 0 |
| 21.87.66.81 | 358040145 | 0 |
| 21.87.66.82 | 358040146 | 0 |
| 21.87.66.83 | 358040147 | 0 |
| 21.87.66.84 | 358040148 | 0 |
| 21.87.66.85 | 358040149 | 0 |