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Autonomous System

AS2497 · Internet Initiative Japan Inc.

Overview

AS2497 is announced on the Internet: RIPE RIS route collectors currently see 250 IPv4 prefixes and 11 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 4,094,976 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 45 upstream neighbours (transit providers or peers) and 331 downstream neighbours (customers or networks it carries). Its most visible upstreams are Cogent Communications, LLC (AS174), Level 3 Parent, LLC (AS3356), and Arelion Sweden AB (AS1299). AS2497 was assigned by ARIN, and its registration country is Japan.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 16, 2026 at 8:58 PM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 172.122.0.1

The trace goes to 172.122.0.1, the first address of 172.122.0.0/15. An address picked inside a prefix may not answer (nothing listens there, or the network filters probes): the trace then shows the path up to the last network that replies.

Announced prefixes

IPv4 prefixes (250 prefixes)

PrefixAddresses
14.137.235.0/24256
14.137.243.0/24256
23.131.136.0/24256
23.159.40.0/24256
23.183.56.0/24256
43.249.241.0/24256
45.38.103.0/24256
45.38.104.0/24256
45.39.42.0/24256
45.39.47.0/24256
45.39.102.0/24256
45.39.159.0/24256
45.39.227.0/24256
45.115.35.0/24256
45.124.63.0/24256
49.239.64.0/1816,384
58.138.0.0/1732,768
58.138.128.0/1816,384
61.122.224.0/204,096
61.124.0.0/204,096
61.124.16.0/204,096
61.211.96.0/198,192
79.170.199.0/24256
80.47.64.0/204,096
80.47.80.0/204,096
81.203.0.0/1665,536
89.30.176.0/23512
101.128.128.0/1732,768
103.2.57.0/24256
103.2.58.0/23512
103.5.23.0/24256
103.6.20.0/24256
103.6.21.0/24256
103.6.22.0/24256
103.11.239.0/24256
103.26.166.0/24256
103.26.167.0/24256
103.76.87.0/24256
103.140.136.0/23512
103.245.235.0/24256
104.164.85.0/24256
104.164.92.0/24256
104.164.100.0/24256
104.164.132.0/24256
104.164.133.0/24256
104.165.87.0/24256
104.165.174.0/24256
104.165.181.0/24256
104.165.202.0/24256
104.165.254.0/24256
104.252.22.0/24256
104.252.84.0/221,024
104.252.125.0/24256
104.252.126.0/24256
104.252.132.0/24256
104.253.94.0/24256
104.253.98.0/24256
104.253.239.0/24256
109.66.30.0/23512
113.197.128.0/1732,768
116.118.192.0/204,096
118.151.0.0/1732,768
118.151.128.0/1816,384
119.10.192.0/1816,384
121.50.160.0/212,048
121.102.0.0/1665,536
121.200.200.0/212,048
124.41.0.0/1732,768
124.41.128.0/1816,384
124.147.64.0/1816,384
125.30.0.0/1665,536
129.249.0.0/1665,536
131.248.0.0/1665,536
132.179.0.0/1665,536
133.110.0.0/1665,536
133.111.0.0/1665,536
133.127.0.0/1665,536
133.137.0.0/1665,536
133.142.0.0/1665,536
133.157.32.0/198,192
133.157.72.0/212,048
133.157.80.0/204,096
133.157.96.0/212,048
133.157.104.0/212,048
133.157.112.0/212,048
133.159.0.0/1665,536
133.169.0.0/212,048
133.169.8.0/221,024
133.173.0.0/1665,536
133.173.0.0/1732,768
133.173.128.0/1732,768
133.183.96.0/212,048
133.183.106.0/24256
133.183.128.0/198,192
133.194.0.0/1732,768
133.194.128.0/1816,384
133.194.192.0/198,192
133.194.224.0/204,096
133.194.240.0/212,048
133.194.248.0/221,024

Showing the first 100 of 250, in address order. Complete list on RIPEstat

IPv6 prefixes (11 prefixes)

Prefix
2001:240::/32
2001:300::/32
2001:48b0::/32
2400:3980::/32
2401:ce20:c::/48
2401:ce20:d::/48
2401:ce20:e::/48
2403:5700::/48
2403:5700:1::/48
240a:71:8000::/36
240a:71:9000::/36

Neighbours

Upstreams (transit or peers) (45)

ASNetworkVisibility
AS174Cogent Communications, LLC50,435
AS3356Level 3 Parent, LLC44,917
AS1299Arelion Sweden AB32,549
AS2914NTT America, Inc.23,355
AS6939Hurricane Electric LLC21,739
AS6453TATA COMMUNICATIONS (AMERICA) INC17,690
AS3257GTT Communications Inc.14,621
AS5511Opentransit Orange S.A.6,355
AS3491PCCW Global (HK) Ltd.5,320
AS3320Deutsche Telekom AG4,670
AS701Verizon Business4,416
AS6461Zayo Bandwidth4,395
AS12389PJSC Rostelecom3,487
AS9498BHARTI Airtel Ltd.2,913
AS13030Init7 (Switzerland) Ltd.2,878
AS4637Telstra Global2,746
AS9370-2,670
AS12956TELEFONICA GLOBAL SOLUTIONS SL2,652
AS1273IDDQD-AS2,498
AS37468Angola Cables2,299
AS6830LibertyGlobal Liberty Global Europe Holding B.V.1,935
AS3303Swisscom (Schweiz) AG1,247
AS20485Joint Stock Company TransTeleCom1,229
AS9121-1,064
AS8359MTS PJSC1,000
AS1257Tele2 Sverige AB959
AS577-949
AS58453China Mobile International Limited945
AS6057Administracion Nacional de Telecomunicaciones925
AS30781Free Pro SAS875

The 30 most visible of 45.

Downstreams (customers) (331)

ASNetworkVisibility
AS2907Research Organization of Information and Systems, National Institute of Informatics19,330
AS3356Level 3 Parent, LLC17,415
AS174Cogent Communications, LLC15,924
AS6453TATA COMMUNICATIONS (AMERICA) INC8,362
AS1299Arelion Sweden AB7,447
AS2914NTT America, Inc.7,419
AS3257GTT Communications Inc.6,363
AS9824JCOM Co., Ltd.4,154
AS55391INTERNET MULTIFEED CO.3,169
AS6461Zayo Bandwidth2,848
AS9498BHARTI Airtel Ltd.2,808
AS12956TELEFONICA GLOBAL SOLUTIONS SL2,720
AS12389PJSC Rostelecom2,299
AS7018AT&T Enterprises, LLC1,848
AS216211CYBERVERSE LLC1,626
AS3491PCCW Global (HK) Ltd.1,617
AS10010-1,510
AS3216PJSC "Vimpelcom"1,436
AS5511Opentransit Orange S.A.1,408
AS2519-1,392
AS4785-1,325
AS150363-1,315
AS55900-1,302
AS3320Deutsche Telekom AG1,277
AS153371-1,184
AS4637Telstra Global994
AS7670-933
AS3605-929
AS37468Angola Cables928
AS17511-927

The 30 most visible of 331.

292 more neighbours appear on both sides of this network depending on the path, so they are counted in neither list.

Visibility is RIPEstat's count of how often the route collectors observed the link. It compares neighbours with each other; it is not a traffic volume.

How to read this page

An Autonomous System (AS) is a network run under one routing policy: an internet provider, a cloud, a content network, a university. Each one has a number, its ASN, assigned by a regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and uses BGP, the protocol networks use to tell each other where addresses are, to announce the blocks of addresses it delivers to.

A prefix such as 203.0.113.0/24 is a block of addresses: the number after the slash says how many bits are fixed, so a /24 holds 256 IPv4 addresses and a /16 holds 65,536. Networks often announce a large block and smaller pieces of it at the same time, which is why the address total counts each address once.

Neighbours come from the paths themselves. A network that appears just before this one in a path, on the collector's side, is an upstream: a transit provider or a peer. One that appears just after it is a downstream, usually a customer. Peering at an internet exchange also shows up as an upstream, so the upstream list is not a list of paid transit.

The data comes from RIPEstat, run by the RIPE NCC, which gathers the routing tables of hundreds of networks through its RIS route collectors. This page reads it when it is visited and keeps it for 12 hours at most; the BGP viewer reads it live.

Frequently asked questions

How do I find the ASN of an IP address?
Type the address in the BGP viewer: it shows the prefix that covers it, the AS that originates that prefix and the paths seen towards it. A traceroute also names the network of each hop, so you can see every AS a connection crosses.
Why does one company have several ASNs?
Large operators split their network by region, by activity or by history: a cloud may use one number for its backbone and another for a region, and every acquisition brings its own numbers. Each number has its own page, with its own prefixes and neighbours.
Why do prefix counts differ from one site to another?
Each source sees the routing table from different collectors, at a different time, and counts differently: some include prefixes withdrawn in recent weeks, some merge a block and its pieces. This page counts the prefixes RIPE RIS collectors see originated by the network at the end of the latest two-week window, and counts each IPv4 address once.
Is this the list of IP ranges of a cloud provider?
It is what its networks announce, which is what the Internet routes to them. Many providers also publish an official list of ranges per service and region; that list is the reference for firewall rules, because a range can be announced before it is used, or announced by another of their AS numbers.