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Autonomous System

AS19108 · Optimum

Overview

AS19108 is announced on the Internet: RIPE RIS route collectors currently see 408 IPv4 prefixes and 27 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 2,848,256 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 11 upstream neighbours (transit providers or peers) and 72 downstream neighbours (customers or networks it carries). Its most visible upstreams are Arelion Sweden AB (AS1299), Cogent Communications, LLC (AS174), and Level 3 Parent, LLC (AS3356). AS19108 was assigned by ARIN, and its registration country is United States.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 1:55 AM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 47.208.0.1

The trace goes to 47.208.0.1, the first address of 47.208.0.0/12. 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 (408 prefixes)

PrefixAddresses
24.31.17.0/24256
24.32.0.0/1665,536
24.32.0.0/204,096
24.32.24.0/212,048
24.32.32.0/212,048
24.32.130.0/24256
24.49.194.0/24256
24.49.200.0/24256
24.54.114.0/24256
24.54.116.0/24256
24.54.117.0/24256
24.54.118.0/24256
24.54.119.0/24256
24.72.175.0/24256
24.72.186.0/23512
24.75.113.0/24256
24.75.123.0/24256
24.75.124.0/24256
24.75.126.0/24256
24.121.0.0/1665,536
24.121.0.0/1732,768
24.121.83.0/24256
24.121.88.0/24256
24.121.128.0/1732,768
24.156.0.0/1732,768
24.156.0.0/1816,384
24.156.15.0/24256
24.156.34.0/24256
24.156.64.0/1816,384
24.156.96.0/204,096
24.156.112.0/204,096
24.206.128.0/1732,768
24.206.202.0/24256
24.206.216.0/221,024
24.206.224.0/198,192
24.213.120.0/24256
24.223.86.0/24256
24.224.36.0/23512
24.224.44.0/24256
24.224.55.0/24256
24.224.56.0/24256
24.224.58.0/23512
24.224.60.0/221,024
24.245.68.0/23512
24.245.72.0/221,024
47.208.0.0/121,048,576
47.208.0.0/15131,072
47.209.64.0/1816,384
47.209.80.0/204,096
47.209.128.0/1732,768
47.209.192.0/198,192
47.210.0.0/15131,072
47.210.0.0/1732,768
47.210.128.0/1732,768
47.211.144.0/204,096
47.211.192.0/204,096
47.211.208.0/204,096
47.212.0.0/14262,144
47.212.0.0/1732,768
47.212.96.0/198,192
47.212.192.0/204,096
47.213.0.0/1665,536
47.213.112.0/204,096
47.213.182.0/23512
47.214.0.0/1665,536
47.214.28.0/221,024
47.214.32.0/221,024
47.214.36.0/221,024
47.214.40.0/221,024
47.214.44.0/221,024
47.214.48.0/221,024
47.214.128.0/1816,384
47.214.192.0/1816,384
47.215.32.0/23512
47.215.68.0/221,024
47.215.96.0/204,096
47.215.128.0/1732,768
47.215.128.0/1816,384
47.215.192.0/1816,384
47.216.0.0/1665,536
47.216.0.0/1732,768
47.216.128.0/1732,768
47.216.144.0/204,096
47.217.0.0/1665,536
47.217.128.0/1816,384
47.217.192.0/1816,384
47.218.0.0/15131,072
47.218.0.0/1732,768
47.218.8.0/221,024
47.218.12.0/221,024
47.218.16.0/221,024
47.218.20.0/221,024
47.218.128.0/1732,768
47.219.0.0/1732,768
47.219.128.0/1732,768
47.219.176.0/204,096
47.220.0.0/14262,144
47.221.0.0/1732,768
47.221.128.0/1732,768
47.223.0.0/1732,768

Showing the first 100 of 408, in address order. Complete list on RIPEstat

IPv6 prefixes (27 prefixes)

Prefix
2600:5400:1000::/36
2600:5400:2000::/36
2600:5400:3000::/36
2600:5400:7000::/36
2600:5400:8000::/33
2600:5400:8000::/48
2600:5400:8001::/48
2600:5400:8800::/48
2600:5400:9000::/48
2600:5400:9001::/48
2600:5400:9002::/48
2600:5400:9003::/48
2600:5400:cd00::/48
2600:5400:cd01::/48
2600:5400:cd02::/48
2600:5400:cd03::/48
2600:5400:cd04::/48
2600:5400:ce00::/48
2600:5400:d101::/48
2600:5400:e100::/48
2600:5400:eb00::/48
2600:5400:eb01::/48
2600:5401::/44
2600:5408::/32
2600:5408::/44
2600:541e::/44
2620:121:d000::/44

Neighbours

Upstreams (transit or peers) (11)

ASNetworkVisibility
AS1299Arelion Sweden AB7,165
AS174Cogent Communications, LLC4,519
AS3356Level 3 Parent, LLC4,200
AS6939Hurricane Electric LLC972
AS3303Swisscom (Schweiz) AG354
AS5650Frontier Communications of America, Inc.252
AS60068Datacamp Limited138
AS8220COLT Technology Services Group Limited26
AS41095IPTP LTD3
AS6327Shaw Communications1
AS29838-1

Downstreams (customers) (72)

ASNetworkVisibility
AS398089Raven Rock Networks, Inc.693
AS26867Brookshire Grocery Company528
AS394072Abilene Independent School District521
AS12231Conway Corporation509
AS400004SecureNet478
AS53488Optimum Online454
AS396028Vidant Health446
AS400727Concho Valley Electric Cooperative, Inc.353
AS32458IND. CO. CABLE TV, INC.337
AS46169City of Georgetown331
AS397354-326
AS63400-268
AS22191-264
AS26920-262
AS400117-262
AS26921-261
AS40919-261
AS47064-261
AS6653Vero Broadband260
AS40420-260
AS32500-259
AS40600-259
AS54958-259
AS397140-259
AS22752-258
AS46925-258
AS393393-258
AS31861-257
AS395183ETEC257
AS20020-252

The 30 most visible of 72.

5 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.