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Autonomous System

AS6181 · Cincinnati Bell Telephone Company LLC

Overview

AS6181 is announced on the Internet: RIPE RIS route collectors currently see 116 IPv4 prefixes and 2 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 825,088 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 9 upstream neighbours (transit providers or peers) and 51 downstream neighbours (customers or networks it carries). Its most visible upstreams are Hurricane Electric LLC (AS6939), Level 3 Parent, LLC (AS3356), and Cogent Communications, LLC (AS174). AS6181 was assigned by ARIN, and its registration country is United States.

Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 17, 2026 at 12:54 AM UTC. This page is refreshed at most every 12 hours.

Go further

Trace a route to this networkOpen in the BGP viewerWHOIS of 50.5.0.1

The trace goes to 50.5.0.1, the first address of 50.5.0.0/16. 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 (116 prefixes)

PrefixAddresses
44.32.193.0/24256
45.59.32.0/204,096
50.5.0.0/1665,536
50.5.0.0/1732,768
50.5.128.0/1732,768
63.250.64.0/198,192
64.151.128.0/1816,384
66.42.128.0/1732,768
66.42.128.0/1816,384
66.42.192.0/1816,384
66.117.192.0/1816,384
66.117.192.0/198,192
66.117.224.0/198,192
66.158.160.0/204,096
66.161.128.0/1732,768
66.161.128.0/1816,384
66.161.192.0/1816,384
66.170.160.0/204,096
67.201.70.0/24256
67.201.87.0/24256
67.201.97.0/24256
67.201.103.0/24256
69.5.32.0/204,096
69.24.16.0/24256
69.24.17.0/24256
69.24.18.0/24256
69.24.19.0/24256
69.24.20.0/24256
69.24.21.0/24256
69.24.22.0/24256
69.24.23.0/24256
69.24.24.0/24256
69.24.25.0/24256
69.24.26.0/24256
69.24.27.0/24256
69.24.31.0/24256
69.39.128.0/198,192
69.61.128.0/1732,768
69.61.128.0/1816,384
69.61.192.0/1816,384
72.49.0.0/1665,536
72.49.0.0/1732,768
72.49.128.0/1732,768
74.83.0.0/1665,536
74.83.0.0/1732,768
74.83.128.0/1732,768
74.83.184.0/24256
74.215.0.0/1665,536
74.215.0.0/1732,768
74.215.128.0/1732,768
131.241.0.0/1665,536
131.241.0.0/1732,768
131.241.128.0/1732,768
161.155.0.0/1665,536
161.155.8.0/212,048
161.155.16.0/212,048
161.155.24.0/212,048
161.155.40.0/212,048
161.155.64.0/212,048
161.155.72.0/212,048
161.155.80.0/212,048
161.155.88.0/212,048
161.155.96.0/198,192
161.155.128.0/212,048
161.155.136.0/212,048
161.155.168.0/212,048
161.155.176.0/212,048
161.155.184.0/212,048
161.155.192.0/198,192
161.155.224.0/198,192
163.182.0.0/1732,768
163.182.0.0/1816,384
163.182.64.0/1816,384
170.248.93.0/24256
170.248.94.0/24256
170.248.95.0/24256
170.251.24.0/212,048
173.246.112.0/221,024
173.246.116.0/221,024
173.246.116.0/24256
173.246.117.0/24256
173.246.118.0/24256
173.246.119.0/24256
173.246.120.0/221,024
173.246.124.0/24256
173.246.125.0/24256
173.246.126.0/24256
173.246.127.0/24256
192.24.128.0/1732,768
192.24.128.0/1816,384
192.24.192.0/1816,384
198.133.79.0/24256
198.135.78.0/24256
198.180.183.0/24256
199.248.226.0/24256
204.63.152.0/221,024
205.167.184.0/23512
206.221.224.0/204,096
208.102.0.0/1665,536
208.102.0.0/1732,768

Showing the first 100 of 116, in address order. Complete list on RIPEstat

IPv6 prefixes (2 prefixes)

Prefix
2600:2b00::/28
2607:f500::/32

Neighbours

Upstreams (transit or peers) (9)

ASNetworkVisibility
AS6939Hurricane Electric LLC10,692
AS3356Level 3 Parent, LLC1,095
AS174Cogent Communications, LLC1,045
AS3257GTT Communications Inc.1,023
AS60068Datacamp Limited57
AS137409GSL Networks Pty LTD7
AS286GTT Communications Inc.6
AS8359MTS PJSC4
AS6327Shaw Communications1

Downstreams (customers) (51)

ASNetworkVisibility
AS14428Pomeroy Technologies LLC554
AS400436Kentucky Communications Network Authority (KCNA)491
AS20040Western & Southern Financial Group Inc.455
AS26804CBTS Technology Solutions LLC434
AS32411AssureRx Health, Inc.433
AS401183James Stegemeyer, Sole Proprietorship353
AS395176Encore Technologies340
AS14789Cloudflare, Inc.331
AS33167Southwest Ohio Computer Association297
AS18527UC Health, LLC293
AS62533-289
AS27365-281
AS17466-280
AS20416-278
AS393231-278
AS15314-277
AS17089-277
AS26241-277
AS26720-277
AS30035-277
AS19263-276
AS19266-276
AS35928BECKMAN COULTER, INC.276
AS397189-276
AS46925-275
AS63115-275
AS21869-274
AS36651-274
AS40059-274
AS32733-273

The 30 most visible of 51.

3 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.