$ query “AS4538” --type=asn → 1 result(s)
AS4538 · ERX-CERNET-BKB
China Education and Research Network Center
AS4538 is owned by China Education and Research Network Center and is a mid-size transit provider, established in China. The system announces a whopping 17.2 million IPv4 addresses (0.46% of routable IPv4 space), including a /12, and supports IPv6. Most of its address space is geolocated to China, with additional presence in Australia and Singapore. This AS has recently updated its prefix announcements.
- Top 5% — Top 5% of all autonomous systems by reach and degree
- Space Overlord — Over 10 million IPv4 addresses
- #6 in China — Top 10 by reach within country
Basic Information
- Country
- 🇨🇳 China
- Category
- Education/Research
- Network Role
- Mid-size Transit
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Last Changed
- March 04, 2026
- Last Seen
- April 28, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 5 230 / 77
- IPv6 Prefixes (raw / aggregated)
- 8 / 6
- IPv4 Addresses
- 17 176 320
- Largest IPv4 Prefix
- /12 (1 048 576 addresses)
- Largest IPv6 Prefix
- /40
- Geolocated Countries
- 🇨🇳 China (29 369 856 IPs), 🇦🇺 Australia (524 288 IPs), 🇸🇬 Singapore (32 IPs)
- Prefix Changed
- April 27, 2026
Reputation
- Reputation
- Good — 29 flagged IPs out of 17 176 320 total (0.00%)
Connectivity Summary
- Upstream Providers
- 11 upstreams providing transit
- Peers
- 37 networks exchanging traffic without transit
- Downstream Customers
- 12 downstreams buying transit
- Unclassified
- 4 unclassified BGP neighbors
- Degree
- 64 unique BGP neighbors
- Reach
- 1 625 networks in customer cone
Upstream Providers (11)
- AS174 — COGENT-174 (Tier-1 transit)
- AS1299 — TWELVE99 (Tier-1 transit)
- AS2914 — NTT-DATA-2914 (Tier-1 transit)
- AS58453 — CMI-INT-HK
- AS23764 — CTGNET
- AS3491 — PCCWG-APAC-HK (Tier-1 transit)
- AS6453 — AS6453 (Tier-1 transit)
- AS4134 — CHINANET-BACKBONE
- AS4837 — CHINA169-BACKBONE
- AS140570 — HKBCS-AS-AP
- and 1 more
Prefix Lists
IPv4 Prefixes (5 230 total)
- 58.192.0.0/12 (1 048 576 addresses (/12 prefix))
- 222.192.0.0/12 (1 048 576 addresses (/12 prefix))
- 202.192.0.0/12 (1 048 576 addresses (/12 prefix))
- 210.32.0.0/12 (1 048 576 addresses (/12 prefix))
- 59.64.0.0/12 (1 048 576 addresses (/12 prefix))
- 222.16.0.0/12 (1 048 576 addresses (/12 prefix))
- 202.112.0.0/13 (524 288 addresses (/13 prefix))
- 211.80.0.0/13 (524 288 addresses (/13 prefix))
- 125.216.0.0/13 (524 288 addresses (/13 prefix))
- 219.224.0.0/13 (524 288 addresses (/13 prefix))
- 211.64.0.0/13 (524 288 addresses (/13 prefix))
- 219.216.0.0/13 (524 288 addresses (/13 prefix))
- 218.192.0.0/13 (524 288 addresses (/13 prefix))
- 49.52.0.0/14 (262 144 addresses (/14 prefix))
- 101.4.0.0/14 (262 144 addresses (/14 prefix))
- 49.120.0.0/14 (262 144 addresses (/14 prefix))
- 210.28.0.0/14 (262 144 addresses (/14 prefix))
- 42.244.0.0/14 (262 144 addresses (/14 prefix))
- 121.192.0.0/14 (262 144 addresses (/14 prefix))
- 183.172.0.0/14 (262 144 addresses (/14 prefix))
- 219.244.0.0/14 (262 144 addresses (/14 prefix))
- 122.204.0.0/14 (262 144 addresses (/14 prefix))
- 121.248.0.0/14 (262 144 addresses (/14 prefix))
- 115.24.0.0/14 (262 144 addresses (/14 prefix))
- 111.186.0.0/15 (131 072 addresses (/15 prefix))
- 110.64.0.0/15 (131 072 addresses (/15 prefix))
- 223.128.0.0/15 (131 072 addresses (/15 prefix))
- 223.2.0.0/15 (131 072 addresses (/15 prefix))
- 116.56.0.0/15 (131 072 addresses (/15 prefix))
- 118.202.0.0/15 (131 072 addresses (/15 prefix))
- 118.228.0.0/15 (131 072 addresses (/15 prefix))
- 1.184.0.0/15 (131 072 addresses (/15 prefix))
- 120.94.0.0/15 (131 072 addresses (/15 prefix))
- 121.48.0.0/15 (131 072 addresses (/15 prefix))
- 49.140.0.0/15 (131 072 addresses (/15 prefix))
- 115.154.0.0/15 (131 072 addresses (/15 prefix))
- 49.208.0.0/15 (131 072 addresses (/15 prefix))
- 114.212.0.0/15 (131 072 addresses (/15 prefix))
- 113.54.0.0/15 (131 072 addresses (/15 prefix))
- 219.242.0.0/15 (131 072 addresses (/15 prefix))
- 58.154.0.0/15 (131 072 addresses (/15 prefix))
- 101.76.0.0/15 (131 072 addresses (/15 prefix))
- 175.186.0.0/15 (131 072 addresses (/15 prefix))
- 180.84.0.0/15 (131 072 addresses (/15 prefix))
- 115.156.0.0/15 (131 072 addresses (/15 prefix))
- 180.208.0.0/15 (131 072 addresses (/15 prefix))
- 183.168.0.0/15 (131 072 addresses (/15 prefix))
- 210.26.0.0/15 (131 072 addresses (/15 prefix))
- 111.114.0.0/15 (131 072 addresses (/15 prefix))
- 202.120.0.0/15 (131 072 addresses (/15 prefix))
- and 27 more
IPv6 Prefixes (8 total)
- 2001:da8:ff00::/40
- 2001:daa:2::/47
- 2001:daa:4::/47
- 2001:da8:257::/48
- 2001:daa:1::/48
- 2001:daa:6::/48