AS4538 China Education and Research Network Center

ERX-CERNET-BKB - China Education and Research Network Center · registered in China

IPv4 addresses16,445,6963,283 prefixes · 0.525% of announced IPv4

Rank in China#4largest network in CN by IPv4 space, of 601 · 5.63% of CN

Rank worldwide#25of 79,396 networks with IPv4

IPv68 x /486 prefixes

CountryChina5,117 ASNs registered there

Open AS4538 in ASN lookup Look up an IP in this network (1.51.0.1) All networks in China

IPv4 prefixes

First 500 of 3,283 prefixes, in address order.

1.51.0.0/22
1.51.4.0/22
1.51.8.0/21
1.51.16.0/20
1.51.32.0/19
1.51.64.0/18
1.51.128.0/17
1.184.0.0/15
42.244.0.0/16
42.245.0.0/17
42.245.128.0/18
42.246.0.0/16
42.247.0.0/21
42.247.8.0/22
42.247.12.0/23
42.247.14.0/23
42.247.16.0/23
42.247.18.0/24
42.247.19.0/24
42.247.20.0/24
42.247.21.0/24
42.247.22.0/23
42.247.24.0/22
42.247.28.0/23
42.247.30.0/24
42.247.31.0/24
42.247.32.0/20
42.247.48.0/22
42.247.52.0/23
42.247.54.0/23
42.247.56.0/23
42.247.58.0/24
42.247.59.0/24
42.247.60.0/22
42.247.64.0/19
42.247.96.0/21
42.247.104.0/22
42.247.108.0/22
42.247.112.0/23
42.247.114.0/23
42.247.116.0/22
42.247.120.0/21
42.247.128.0/17
49.52.0.0/19
49.52.32.0/20
49.52.48.0/24
49.52.49.0/24
49.52.50.0/23
49.52.52.0/22
49.52.56.0/21
49.52.64.0/18
49.52.128.0/17
49.53.0.0/16
49.54.0.0/15
49.120.0.0/18
49.120.64.0/19
49.120.96.0/19
49.120.128.0/17
49.121.0.0/16
49.122.0.0/18
49.122.64.0/22
49.122.68.0/22
49.122.72.0/21
49.122.80.0/20
49.122.96.0/19
49.122.128.0/18
49.122.192.0/18
49.123.0.0/17
49.123.128.0/17
49.141.0.0/19
49.141.32.0/20
49.141.48.0/20
49.141.64.0/18
49.141.128.0/20
49.141.144.0/21
49.141.152.0/21
49.141.160.0/19
49.141.192.0/20
49.141.208.0/23
49.141.210.0/24
49.141.211.0/24
49.141.212.0/22
49.141.216.0/21
49.141.224.0/19
49.208.0.0/15
58.154.0.0/20
58.154.32.0/23
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58.154.48.0/20
58.154.64.0/19
58.154.96.0/20
58.154.112.0/20
58.154.128.0/17
58.155.0.0/19
58.155.32.0/20
58.155.48.0/22
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58.155.56.0/21
58.155.64.0/21
58.155.72.0/21
58.155.80.0/20
58.155.96.0/20
58.155.112.0/20
58.155.128.0/20
58.155.144.0/22
58.155.148.0/22
58.155.152.0/21
58.155.160.0/19
58.155.192.0/18
58.192.0.0/15
58.194.0.0/21
58.194.8.0/23
58.194.10.0/23
58.194.12.0/22
58.194.16.0/20
58.194.32.0/19
58.194.64.0/18
58.194.128.0/18
58.194.192.0/18
58.195.0.0/18
58.195.64.0/19
58.195.96.0/23
58.195.98.0/23
58.195.100.0/22
58.195.104.0/21
58.195.112.0/20
58.195.128.0/17
58.196.0.0/17
58.196.128.0/19
58.196.160.0/20
58.196.176.0/23
58.196.178.0/24
58.196.179.0/24
58.196.180.0/22
58.196.184.0/21
58.196.192.0/18
58.197.0.0/16
58.198.0.0/15
58.200.0.0/23
58.200.2.0/24
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58.200.11.0/24
58.200.12.0/22
58.200.16.0/20
58.200.32.0/19
58.200.64.0/22
58.200.68.0/24
58.200.69.0/24
58.200.70.0/23
58.200.72.0/22
58.200.76.0/23
58.200.78.0/23
58.200.80.0/21
58.200.88.0/22
58.200.92.0/23
58.200.94.0/23
58.200.96.0/23
58.200.98.0/23
58.200.100.0/22
58.200.104.0/21
58.200.112.0/23
58.200.114.0/24
58.200.115.0/24
58.200.116.0/23
58.200.118.0/23
58.200.120.0/22
58.200.124.0/23
58.200.126.0/23
58.200.128.0/21
58.200.136.0/22
58.200.140.0/23
58.200.142.0/23
58.200.144.0/20
58.200.160.0/19
58.200.192.0/20
58.200.208.0/21
58.200.216.0/22
58.200.220.0/22
58.200.224.0/20
58.200.240.0/21
58.200.248.0/22
58.200.252.0/23
58.200.254.0/23
58.201.0.0/16
58.202.0.0/15
58.204.0.0/16
58.205.0.0/17
58.205.128.0/18
58.205.192.0/22
58.205.196.0/23
58.205.198.0/23
58.205.200.0/21
58.205.208.0/22
58.205.212.0/23
58.205.214.0/23
58.205.216.0/21
58.205.224.0/19
58.206.0.0/19
58.206.32.0/19
58.206.64.0/18
58.206.128.0/23
58.206.130.0/23
58.206.132.0/24
58.206.133.0/24
58.206.134.0/23
58.206.136.0/21
58.206.144.0/20
58.206.160.0/19
58.207.0.0/16
59.64.0.0/20
59.64.16.0/24
59.64.17.0/24
59.64.18.0/23
59.64.20.0/22
59.64.24.0/21
59.64.32.0/19
59.64.64.0/19
59.64.96.0/20
59.64.112.0/21
59.64.120.0/22
59.64.124.0/23
59.64.126.0/24
59.64.127.0/24
59.64.128.0/17
59.65.0.0/17
59.65.128.0/18
59.65.192.0/21
59.65.200.0/21
59.65.208.0/20
59.65.224.0/20
59.65.240.0/20
59.66.0.0/16
59.67.0.0/21
59.67.8.0/21
59.67.16.0/20
59.67.32.0/19
59.67.64.0/18
59.67.128.0/22
59.67.132.0/23
59.67.134.0/23
59.67.136.0/21
59.67.144.0/20
59.67.160.0/20
59.67.176.0/21
59.67.184.0/21
59.67.192.0/22
59.67.196.0/22
59.67.200.0/21
59.67.208.0/21
59.67.216.0/22
59.67.220.0/23
59.67.222.0/23
59.67.224.0/19
59.68.0.0/18
59.68.64.0/19
59.68.96.0/20
59.68.112.0/23
59.68.114.0/23
59.68.116.0/22
59.68.120.0/21
59.68.128.0/18
59.68.192.0/19
59.68.224.0/21
59.68.232.0/23
59.68.234.0/23
59.68.236.0/22
59.68.240.0/20
59.69.0.0/17
59.69.128.0/18
59.69.192.0/19
59.69.224.0/19
59.70.0.0/19
59.70.32.0/22
59.70.36.0/24
59.70.37.0/24
59.70.38.0/23
59.70.40.0/21
59.70.48.0/24
59.70.49.0/24
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59.70.52.0/22
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59.70.64.0/18
59.70.128.0/21
59.70.136.0/21
59.70.144.0/20
59.70.160.0/19
59.70.192.0/18
59.71.0.0/19
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59.71.56.0/22
59.71.60.0/22
59.71.64.0/19
59.71.96.0/23
59.71.98.0/23
59.71.100.0/22
59.71.104.0/21
59.71.112.0/20
59.71.128.0/17
59.72.0.0/17
59.72.128.0/18
59.72.192.0/24
59.72.193.0/24
59.72.194.0/23
59.72.196.0/22
59.72.200.0/21
59.72.208.0/20
59.72.224.0/21
59.72.232.0/21
59.72.240.0/20
59.73.0.0/20
59.73.16.0/21
59.73.24.0/21
59.73.32.0/19
59.73.64.0/18
59.73.168.0/21
59.73.176.0/20
59.73.192.0/19
59.73.224.0/19
59.74.0.0/19
59.74.32.0/22
59.74.36.0/23
59.74.38.0/23
59.74.40.0/22
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59.74.51.0/24
59.74.52.0/22
59.74.56.0/22
59.74.60.0/23
59.74.62.0/23
59.74.64.0/18
59.74.128.0/20
59.74.144.0/20
59.74.160.0/19
59.74.192.0/19
59.74.224.0/20
59.74.240.0/21
59.74.248.0/24
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59.74.250.0/23
59.74.252.0/22
59.75.0.0/22
59.75.4.0/22
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59.75.16.0/20
59.75.32.0/20
59.75.48.0/22
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59.75.56.0/21
59.75.64.0/18
59.75.128.0/21
59.75.136.0/22
59.75.140.0/23
59.75.142.0/24
59.75.143.0/24
59.75.144.0/22
59.75.148.0/23
59.75.150.0/23
59.75.152.0/21
59.75.160.0/20
59.75.176.0/24
59.75.177.0/24
59.75.178.0/23
59.75.180.0/22
59.75.184.0/21
59.75.192.0/24
59.75.193.0/24
59.75.194.0/23
59.75.196.0/22
59.75.200.0/21
59.75.208.0/24
59.75.209.0/24
59.75.210.0/23
59.75.212.0/22
59.75.216.0/21
59.75.224.0/20
59.75.240.0/21
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59.76.0.0/18
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59.76.240.0/20
59.78.0.0/18
59.78.171.0/24
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101.4.0.0/23
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101.4.192.0/18
101.5.0.0/19
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101.5.48.0/20
101.5.64.0/18
101.5.128.0/17
101.6.0.0/22
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101.6.8.0/21
101.6.16.0/23
101.6.18.0/23
101.6.20.0/22
101.6.24.0/21
101.6.32.0/19
101.6.64.0/18
101.6.128.0/17
101.7.0.0/22
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101.7.8.0/21
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101.7.32.0/19
101.7.64.0/18
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101.7.160.0/24
101.7.161.0/24
101.7.162.0/23
101.7.164.0/22
101.7.168.0/21
101.7.176.0/20
101.7.192.0/19
101.7.224.0/20
101.7.240.0/20
101.76.0.0/17
101.76.128.0/18
101.76.192.0/23
101.76.194.0/23
101.76.196.0/22
101.76.200.0/21
101.76.208.0/20
101.76.224.0/19
101.77.0.0/16
103.31.48.0/22
103.137.60.0/24
103.252.172.0/22
110.64.0.0/17
110.64.128.0/20
110.64.144.0/22
110.64.148.0/23
110.64.150.0/23
110.64.152.0/23
110.64.154.0/23
110.64.156.0/22
110.64.160.0/19
110.64.192.0/18
110.65.0.0/18
110.65.64.0/21
110.65.72.0/21
110.65.80.0/20
110.65.96.0/20
110.65.112.0/23
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110.65.128.0/20
110.65.144.0/22
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110.65.160.0/19
110.65.192.0/18
111.114.0.0/18
111.114.64.0/22
111.114.68.0/22
111.114.72.0/21

IPv6 prefixes

All 6 prefixes.

2001:da8:257::/48
2001:daa:1::/48
2001:daa:2::/47
2001:daa:4::/47
2001:daa:6::/48
2001:daa:9::/48

Similar-sized networks in China

ASNNameIPv4 addresses

AS4134#1 CHINANET-BACKBONE - No.31,Jin-rong Street99,036,416

AS4837#2 CHINA169-Backbone - CHINA UNICOM China169 Backbone57,221,376

AS9808#3 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd.17,288,448

AS37963#5 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd.9,425,920

AS4812#6 CHINANET-SH-AP - China Telecom (Group)7,882,496

AS4808#7 CHINA169-BJ - China Unicom Beijing Province Network7,176,704

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources