The IP address 21.81.54 is provided by China Education and Research Network Center, it's belong to the CDIR (Classless Inter-Domain Routing) 22.30.204.0/23 (range 22.30.204.0 to 22.30.205.255). The autonomous system number (ASN) is 4538.
| ASN | 4538 |
| IP starting by | 22.30.204.0 |
| IP ending by | 22.30.205.255 |
| ASN Name | China Education and Research Network Center |
| CDIR | 22.30.204.0/23 |
| Numerical IP | |
| Registry | |
| Last update | 04/11/2017 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | US | United States | - | Columbus | 39.9664 | -83.0128 | 2017-11-04 |
| MaxMind | US | United States | - | - | 37.751 | -97.822 | 2017-11-04 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 21.81.54.0 | 357643776 | 0 |
| 21.81.54.1 | 357643777 | 0 |
| 21.81.54.2 | 357643778 | 0 |
| 21.81.54.3 | 357643779 | 0 |
| 21.81.54.4 | 357643780 | 0 |
| 21.81.54.5 | 357643781 | 0 |
| 21.81.54.6 | 357643782 | 0 |
| 21.81.54.7 | 357643783 | 0 |
| 21.81.54.8 | 357643784 | 0 |
| 21.81.54.9 | 357643785 | 0 |
| 21.81.54.10 | 357643786 | 0 |
| 21.81.54.11 | 357643787 | 0 |
| 21.81.54.12 | 357643788 | 0 |
| 21.81.54.13 | 357643789 | 0 |
| 21.81.54.14 | 357643790 | 0 |
| 21.81.54.15 | 357643791 | 0 |
| 21.81.54.16 | 357643792 | 0 |
| 21.81.54.17 | 357643793 | 0 |
| 21.81.54.18 | 357643794 | 0 |
| 21.81.54.19 | 357643795 | 0 |
| 21.81.54.20 | 357643796 | 0 |
| 21.81.54.21 | 357643797 | 0 |
| 21.81.54.22 | 357643798 | 0 |
| 21.81.54.23 | 357643799 | 0 |
| 21.81.54.24 | 357643800 | 0 |
| 21.81.54.25 | 357643801 | 0 |
| 21.81.54.26 | 357643802 | 0 |
| 21.81.54.27 | 357643803 | 0 |
| 21.81.54.28 | 357643804 | 0 |
| 21.81.54.29 | 357643805 | 0 |
| 21.81.54.30 | 357643806 | 0 |
| 21.81.54.31 | 357643807 | 0 |
| 21.81.54.32 | 357643808 | 0 |
| 21.81.54.33 | 357643809 | 0 |
| 21.81.54.34 | 357643810 | 0 |
| 21.81.54.35 | 357643811 | 0 |
| 21.81.54.36 | 357643812 | 0 |
| 21.81.54.37 | 357643813 | 0 |
| 21.81.54.38 | 357643814 | 0 |
| 21.81.54.39 | 357643815 | 0 |
| 21.81.54.40 | 357643816 | 0 |
| 21.81.54.41 | 357643817 | 0 |
| 21.81.54.42 | 357643818 | 0 |
| 21.81.54.43 | 357643819 | 0 |
| 21.81.54.44 | 357643820 | 0 |
| 21.81.54.45 | 357643821 | 0 |
| 21.81.54.46 | 357643822 | 0 |
| 21.81.54.47 | 357643823 | 0 |
| 21.81.54.48 | 357643824 | 0 |
| 21.81.54.49 | 357643825 | 0 |
| 21.81.54.50 | 357643826 | 0 |
| 21.81.54.51 | 357643827 | 0 |
| 21.81.54.52 | 357643828 | 0 |
| 21.81.54.53 | 357643829 | 0 |
| 21.81.54.54 | 357643830 | 0 |
| 21.81.54.55 | 357643831 | 0 |
| 21.81.54.56 | 357643832 | 0 |
| 21.81.54.57 | 357643833 | 0 |
| 21.81.54.58 | 357643834 | 0 |
| 21.81.54.59 | 357643835 | 0 |
| 21.81.54.60 | 357643836 | 0 |
| 21.81.54.61 | 357643837 | 0 |
| 21.81.54.62 | 357643838 | 0 |
| 21.81.54.63 | 357643839 | 0 |
| 21.81.54.64 | 357643840 | 0 |
| 21.81.54.65 | 357643841 | 0 |
| 21.81.54.66 | 357643842 | 0 |
| 21.81.54.67 | 357643843 | 0 |
| 21.81.54.68 | 357643844 | 0 |
| 21.81.54.69 | 357643845 | 0 |
| 21.81.54.70 | 357643846 | 0 |
| 21.81.54.71 | 357643847 | 0 |
| 21.81.54.72 | 357643848 | 0 |
| 21.81.54.73 | 357643849 | 0 |
| 21.81.54.74 | 357643850 | 0 |
| 21.81.54.75 | 357643851 | 0 |
| 21.81.54.76 | 357643852 | 0 |
| 21.81.54.77 | 357643853 | 0 |
| 21.81.54.78 | 357643854 | 0 |
| 21.81.54.79 | 357643855 | 0 |
| 21.81.54.80 | 357643856 | 0 |
| 21.81.54.81 | 357643857 | 0 |
| 21.81.54.82 | 357643858 | 0 |
| 21.81.54.83 | 357643859 | 0 |
| 21.81.54.84 | 357643860 | 0 |
| 21.81.54.85 | 357643861 | 0 |