AS4538 ERX-CERNET-BKB
China Education and Research Network Center
Not flagged: treated as regular traffic
AS4538 is not on Fraudex's VPN, proxy and datacenter list, so its IPs are treated like ordinary home, mobile or business connections. A single address can still be flagged if it is a Tor exit relay.
Check an IP from AS4538
Look up any address in real time with the free IP checker, or from your own code:
curl "https://fraudex.xyz/api/check?ip=1.51.0.0" \ -H "X-API-Key: fx_your_key"
The answer includes the network (AS4538), the country and a VPN, proxy, Tor and bot verdict, in under a millisecond. Plans start at $40 for 30 days of unlimited lookups.
IPv4 ranges announced by AS4538
Showing the first 100 of 998 ranges.
| First IP | Last IP | CIDR | Addresses |
|---|---|---|---|
| 1.51.0.0 | 1.51.3.255 | 1.51.0.0/22 | 1,024 |
| 1.51.4.0 | 1.51.31.255 | 1.51.4.0/22, 1.51.8.0/21, 1.51.16.0/20 | 7,168 |
| 1.51.56.0 | 1.51.255.255 | 1.51.56.0/21, 1.51.64.0/18, 1.51.128.0/17 | 51,200 |
| 1.184.0.0 | 1.185.255.255 | 1.184.0.0/15 | 131,072 |
| 42.244.0.0 | 42.244.79.255 | 42.244.0.0/18, 42.244.64.0/20 | 20,480 |
| 42.244.80.0 | 42.245.220.255 | 42.244.80.0/20, 42.244.96.0/19, 42.244.128.0/17, 42.245.0.0/17 +5 | 101,632 |
| 42.245.222.0 | 42.245.232.255 | 42.245.222.0/23, 42.245.224.0/21, 42.245.232.0/24 | 2,816 |
| 42.245.233.0 | 42.247.3.255 | 42.245.233.0/24, 42.245.234.0/23, 42.245.236.0/22, 42.245.240.0/20 +2 | 72,448 |
| 42.247.4.0 | 42.247.5.255 | 42.247.4.0/23 | 512 |
| 42.247.6.0 | 42.247.20.255 | 42.247.6.0/23, 42.247.8.0/21, 42.247.16.0/22, 42.247.20.0/24 | 3,840 |
| 42.247.21.0 | 42.247.22.255 | 42.247.21.0/24, 42.247.22.0/24 | 512 |
| 42.247.23.0 | 42.247.31.255 | 42.247.23.0/24, 42.247.24.0/21 | 2,304 |
| 42.247.32.0 | 42.247.33.255 | 42.247.32.0/23 | 512 |
| 42.247.34.0 | 42.247.44.255 | 42.247.34.0/23, 42.247.36.0/22, 42.247.40.0/22, 42.247.44.0/24 | 2,816 |
| 42.247.45.0 | 42.247.53.255 | 42.247.45.0/24, 42.247.46.0/23, 42.247.48.0/22, 42.247.52.0/23 | 2,304 |
| 42.247.54.0 | 42.247.58.255 | 42.247.54.0/23, 42.247.56.0/23, 42.247.58.0/24 | 1,280 |
| 42.247.59.0 | 42.247.94.255 | 42.247.59.0/24, 42.247.60.0/22, 42.247.64.0/20, 42.247.80.0/21 +3 | 9,216 |
| 42.247.95.0 | 42.247.103.255 | 42.247.95.0/24, 42.247.96.0/21 | 2,304 |
| 42.247.104.0 | 42.247.255.255 | 42.247.104.0/21, 42.247.112.0/20, 42.247.128.0/17 | 38,912 |
| 49.52.0.0 | 49.52.64.255 | 49.52.0.0/18, 49.52.64.0/24 | 16,640 |
| 49.52.65.0 | 49.52.95.255 | 49.52.65.0/24, 49.52.66.0/23, 49.52.68.0/22, 49.52.72.0/21 +1 | 7,936 |
| 49.52.96.0 | 49.53.48.255 | 49.52.96.0/19, 49.52.128.0/17, 49.53.0.0/19, 49.53.32.0/20 +1 | 53,504 |
| 49.53.49.0 | 49.55.255.255 | 49.53.49.0/24, 49.53.50.0/23, 49.53.52.0/22, 49.53.56.0/21 +3 | 184,064 |
| 49.120.0.0 | 49.120.95.255 | 49.120.0.0/18, 49.120.64.0/19 | 24,576 |
| 49.120.96.0 | 49.122.67.255 | 49.120.96.0/19, 49.120.128.0/17, 49.121.0.0/16, 49.122.0.0/18 +1 | 123,904 |
| 49.122.68.0 | 49.122.191.255 | 49.122.68.0/22, 49.122.72.0/21, 49.122.80.0/20, 49.122.96.0/19 +1 | 31,744 |
| 49.122.192.0 | 49.123.127.255 | 49.122.192.0/18, 49.123.0.0/17 | 49,152 |
| 49.123.128.0 | 49.123.255.255 | 49.123.128.0/17 | 32,768 |
| 49.141.0.0 | 49.141.47.255 | 49.141.0.0/19, 49.141.32.0/20 | 12,288 |
| 49.141.48.0 | 49.141.151.255 | 49.141.48.0/20, 49.141.64.0/18, 49.141.128.0/20, 49.141.144.0/21 | 26,624 |
| 49.141.152.0 | 49.141.207.255 | 49.141.152.0/21, 49.141.160.0/19, 49.141.192.0/20 | 14,336 |
| 49.141.208.0 | 49.141.210.255 | 49.141.208.0/23, 49.141.210.0/24 | 768 |
| 49.141.211.0 | 49.141.255.255 | 49.141.211.0/24, 49.141.212.0/22, 49.141.216.0/21, 49.141.224.0/19 | 11,520 |
| 49.208.0.0 | 49.209.255.255 | 49.208.0.0/15 | 131,072 |
| 58.154.0.0 | 58.154.34.255 | 58.154.0.0/19, 58.154.32.0/23, 58.154.34.0/24 | 8,960 |
| 58.154.35.0 | 58.154.37.255 | 58.154.35.0/24, 58.154.36.0/23 | 768 |
| 58.154.38.0 | 58.154.63.255 | 58.154.38.0/23, 58.154.40.0/21, 58.154.48.0/20 | 6,656 |
| 58.154.64.0 | 58.154.111.255 | 58.154.64.0/19, 58.154.96.0/20 | 12,288 |
| 58.154.112.0 | 58.155.53.255 | 58.154.112.0/20, 58.154.128.0/17, 58.155.0.0/19, 58.155.32.0/20 +2 | 50,688 |
| 58.155.54.0 | 58.155.63.255 | 58.155.54.0/23, 58.155.56.0/21 | 2,560 |
| 58.155.64.0 | 58.155.71.255 | 58.155.64.0/21 | 2,048 |
| 58.155.72.0 | 58.155.111.255 | 58.155.72.0/21, 58.155.80.0/20, 58.155.96.0/20 | 10,240 |
| 58.155.112.0 | 58.155.147.255 | 58.155.112.0/20, 58.155.128.0/20, 58.155.144.0/22 | 9,216 |
| 58.155.148.0 | 58.155.255.255 | 58.155.148.0/22, 58.155.152.0/21, 58.155.160.0/19, 58.155.192.0/18 | 27,648 |
| 58.192.0.0 | 58.194.9.255 | 58.192.0.0/15, 58.194.0.0/21, 58.194.8.0/23 | 133,632 |
| 58.194.10.0 | 58.194.191.255 | 58.194.10.0/23, 58.194.12.0/22, 58.194.16.0/20, 58.194.32.0/19 +2 | 46,592 |
| 58.194.192.0 | 58.195.7.255 | 58.194.192.0/18, 58.195.0.0/21 | 18,432 |
| 58.195.8.0 | 58.195.97.255 | 58.195.8.0/21, 58.195.16.0/20, 58.195.32.0/19, 58.195.64.0/19 +1 | 23,040 |
| 58.195.98.0 | 58.195.175.255 | 58.195.98.0/23, 58.195.100.0/22, 58.195.104.0/21, 58.195.112.0/20 +2 | 19,968 |
| 58.195.176.0 | 58.196.178.255 | 58.195.176.0/20, 58.195.192.0/18, 58.196.0.0/17, 58.196.128.0/19 +3 | 66,304 |
| 58.196.179.0 | 58.200.2.255 | 58.196.179.0/24, 58.196.180.0/22, 58.196.184.0/21, 58.196.192.0/18 +4 | 217,088 |
| 58.200.3.0 | 58.200.4.255 | 58.200.3.0/24, 58.200.4.0/24 | 512 |
| 58.200.5.0 | 58.200.22.255 | 58.200.5.0/24, 58.200.6.0/23, 58.200.8.0/21, 58.200.16.0/22 +2 | 4,608 |
| 58.200.23.0 | 58.200.31.255 | 58.200.23.0/24, 58.200.24.0/21 | 2,304 |
| 58.200.32.0 | 58.200.68.255 | 58.200.32.0/19, 58.200.64.0/22, 58.200.68.0/24 | 9,472 |
| 58.200.69.0 | 58.200.75.255 | 58.200.69.0/24, 58.200.70.0/23, 58.200.72.0/22 | 1,792 |
| 58.200.76.0 | 58.200.77.255 | 58.200.76.0/23 | 512 |
| 58.200.78.0 | 58.200.91.255 | 58.200.78.0/23, 58.200.80.0/21, 58.200.88.0/22 | 3,584 |
| 58.200.92.0 | 58.200.93.255 | 58.200.92.0/23 | 512 |
| 58.200.94.0 | 58.200.95.255 | 58.200.94.0/23 | 512 |
| 58.200.96.0 | 58.200.97.255 | 58.200.96.0/23 | 512 |
| 58.200.98.0 | 58.200.103.255 | 58.200.98.0/23, 58.200.100.0/22 | 1,536 |
| 58.200.104.0 | 58.200.106.255 | 58.200.104.0/23, 58.200.106.0/24 | 768 |
| 58.200.107.0 | 58.200.109.255 | 58.200.107.0/24, 58.200.108.0/23 | 768 |
| 58.200.110.0 | 58.200.114.255 | 58.200.110.0/23, 58.200.112.0/23, 58.200.114.0/24 | 1,280 |
| 58.200.115.0 | 58.200.117.255 | 58.200.115.0/24, 58.200.116.0/23 | 768 |
| 58.200.118.0 | 58.200.119.255 | 58.200.118.0/23 | 512 |
| 58.200.120.0 | 58.200.125.255 | 58.200.120.0/22, 58.200.124.0/23 | 1,536 |
| 58.200.126.0 | 58.200.141.255 | 58.200.126.0/23, 58.200.128.0/21, 58.200.136.0/22, 58.200.140.0/23 | 4,096 |
| 58.200.142.0 | 58.200.219.255 | 58.200.142.0/23, 58.200.144.0/20, 58.200.160.0/19, 58.200.192.0/20 +2 | 19,968 |
| 58.200.220.0 | 58.200.247.255 | 58.200.220.0/22, 58.200.224.0/20, 58.200.240.0/21 | 7,168 |
| 58.200.248.0 | 58.200.253.255 | 58.200.248.0/22, 58.200.252.0/23 | 1,536 |
| 58.200.254.0 | 58.205.197.255 | 58.200.254.0/23, 58.201.0.0/16, 58.202.0.0/15, 58.204.0.0/16 +4 | 313,344 |
| 58.205.198.0 | 58.205.213.255 | 58.205.198.0/23, 58.205.200.0/21, 58.205.208.0/22, 58.205.212.0/23 | 4,096 |
| 58.205.214.0 | 58.206.133.255 | 58.205.214.0/23, 58.205.216.0/21, 58.205.224.0/19, 58.206.0.0/17 +2 | 45,056 |
| 58.206.134.0 | 58.207.255.255 | 58.206.134.0/23, 58.206.136.0/21, 58.206.144.0/20, 58.206.160.0/19 +2 | 96,768 |
| 59.64.0.0 | 59.64.16.255 | 59.64.0.0/20, 59.64.16.0/24 | 4,352 |
| 59.64.17.0 | 59.64.111.255 | 59.64.17.0/24, 59.64.18.0/23, 59.64.20.0/22, 59.64.24.0/21 +3 | 24,320 |
| 59.64.112.0 | 59.64.126.255 | 59.64.112.0/21, 59.64.120.0/22, 59.64.124.0/23, 59.64.126.0/24 | 3,840 |
| 59.64.127.0 | 59.65.191.255 | 59.64.127.0/24, 59.64.128.0/17, 59.65.0.0/17, 59.65.128.0/18 | 82,176 |
| 59.65.192.0 | 59.65.199.255 | 59.65.192.0/21 | 2,048 |
| 59.65.200.0 | 59.65.239.255 | 59.65.200.0/21, 59.65.208.0/20, 59.65.224.0/20 | 10,240 |
| 59.65.240.0 | 59.67.7.255 | 59.65.240.0/20, 59.66.0.0/16, 59.67.0.0/21 | 71,680 |
| 59.67.8.0 | 59.67.133.255 | 59.67.8.0/21, 59.67.16.0/20, 59.67.32.0/19, 59.67.64.0/18 +2 | 32,256 |
| 59.67.134.0 | 59.67.159.255 | 59.67.134.0/23, 59.67.136.0/21, 59.67.144.0/20 | 6,656 |
| 59.67.160.0 | 59.67.183.255 | 59.67.160.0/20, 59.67.176.0/21 | 6,144 |
| 59.67.184.0 | 59.67.193.255 | 59.67.184.0/21, 59.67.192.0/23 | 2,560 |
| 59.67.194.0 | 59.67.207.255 | 59.67.194.0/23, 59.67.196.0/22, 59.67.200.0/21 | 3,584 |
| 59.67.208.0 | 59.68.113.255 | 59.67.208.0/20, 59.67.224.0/19, 59.68.0.0/18, 59.68.64.0/19 +2 | 41,472 |
| 59.68.114.0 | 59.68.233.255 | 59.68.114.0/23, 59.68.116.0/22, 59.68.120.0/21, 59.68.128.0/18 +3 | 30,720 |
| 59.68.234.0 | 59.69.223.255 | 59.68.234.0/23, 59.68.236.0/22, 59.68.240.0/20, 59.69.0.0/17 +2 | 62,976 |
| 59.69.224.0 | 59.70.36.255 | 59.69.224.0/19, 59.70.0.0/19, 59.70.32.0/22, 59.70.36.0/24 | 17,664 |
| 59.70.37.0 | 59.70.48.255 | 59.70.37.0/24, 59.70.38.0/23, 59.70.40.0/21, 59.70.48.0/24 | 3,072 |
| 59.70.49.0 | 59.70.135.255 | 59.70.49.0/24, 59.70.50.0/23, 59.70.52.0/22, 59.70.56.0/21 +2 | 22,272 |
| 59.70.136.0 | 59.71.59.255 | 59.70.136.0/21, 59.70.144.0/20, 59.70.160.0/19, 59.70.192.0/18 +4 | 46,080 |
| 59.71.60.0 | 59.71.97.255 | 59.71.60.0/22, 59.71.64.0/19, 59.71.96.0/23 | 9,728 |
| 59.71.98.0 | 59.72.192.255 | 59.71.98.0/23, 59.71.100.0/22, 59.71.104.0/21, 59.71.112.0/20 +4 | 89,856 |
| 59.72.193.0 | 59.72.231.255 | 59.72.193.0/24, 59.72.194.0/23, 59.72.196.0/22, 59.72.200.0/21 +2 | 9,984 |
| 59.72.232.0 | 59.73.23.255 | 59.72.232.0/21, 59.72.240.0/20, 59.73.0.0/20, 59.73.16.0/21 | 12,288 |
| 59.73.24.0 | 59.73.223.255 | 59.73.24.0/21, 59.73.32.0/19, 59.73.64.0/18, 59.73.128.0/18 +1 | 51,200 |
IPv6 ranges announced by AS4538
| First IP | Last IP | CIDR |
|---|---|---|
| 2001:da8:257:: | 2001:da8:257:ffff:ffff:ffff:ffff:ffff | 2001:da8:257::/48 |
| 2001:daa:1:: | 2001:daa:6:ffff:ffff:ffff:ffff:ffff | 2001:daa:1::/48, 2001:daa:2::/47, 2001:daa:4::/47, 2001:daa:6::/48 |
Questions about AS4538
Is AS4538 a VPN or hosting network?
Fraudex does not list AS4538 (ERX-CERNET-BKB) as a VPN, proxy or hosting network. Its addresses are treated as regular traffic, apart from any Tor exit relays.
Which country is AS4538 registered in?
AS4538 is registered in China. Individual addresses can be used elsewhere, so check the IP itself when location matters.
How many IP addresses does AS4538 have?
It announces 998 IPv4 ranges with 16,203,232 addresses in total, plus 2 IPv6 ranges.
How do I block traffic from AS4538?
Blocking a whole network by number goes stale as ranges change hands. It is more reliable to check each visitor's IP when they sign up, log in or pay: the Fraudex API returns the network and a VPN and bot verdict, so you can block, challenge or just log flagged traffic. See why an IP blocking API pays for itself.