subnet.im

AS38255China Education and Research Network (CERNET)

ChinaRegistryAPNICTypeCarrier

As of 26th September 2026, AS38255 (China Education and Research Network…), a transit carrier registered in China with APNIC, originates 2 IPv4 prefixes covering 2k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 25,306th-largest of the 79,516 networks we see originating IPv4, and the 360th-largest of 607 in China. It is seen behind 4 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS23911 (China Next Generation Internet Beijing…), and in front of 4,099 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

2

IPv6 prefixes

3

IPv4 addresses

2k

IPv6 /64s

4.3B

Upstream graph

The networks AS38255 is seen behind, one and two hops out, drawn from real AS paths.

AS38255Toward the internet core
Upstream graph for AS38255: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS38255China Education a…This networkAS6939Hurricane Electri…AS23911China Next Genera…AS24239TWD2 Education an…AS209300Wende TanAS18106Viewqwest Pte LtdAS20130Depaul UniversityAS3491PCCW Global (HK) …AS4842Tianhai InfoTechAS20473The Constant Comp…AS212683Olilo UK & Irelan…

Networks observed one and two hops upstream of AS38255 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

8,205

adjacent networks

Upstreams
40%
Peers
4,10250%
Downstreams
4,09950%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS38255
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer230,181143
AS23911China Next Generation Internet Beijing IXCNPeer29,29366
AS24239TWD2 Education and Research NetworkCNPeer15164
AS209300Wende TanCNPeer10364

Prefixes

The largest blocks AS38255 originates, widest first.

Largest prefixes originated by AS38255
PrefixAddressesVisibility
118.229.40.0/221k78/81
118.229.44.0/221k81/81
2001:255::/324.3B × /6464/64
2a0e:b107:740::/441M × /6464/64
2a0e:aa06:49f::/4865.5k × /6464/64

Routing health

How AS38255's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid100.0%5
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%5
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 3 prefixes

  • /324.3B × /6433.3%1
  • /441M × /6433.3%1
  • /4865.5k × /6433.3%1

Recent changes

Announcements that started or stopped since 27th Aug 2026.

No announcement by AS38255 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.