HomeASN LookupAS33491

AS33491 COMCAST-33491 - Comcast Cable Communications, LLC

🇺🇸
ARINassigned
Announced Prefixes (BGP)
572total
343 IPv4229 IPv6
IPv4 Addresses
Allocated (RIR)17,920
Announced (BGP)3.1M
IPv6 Addresses
Allocated (RIR)0
Announced (BGP)2×10³¹
Prefix Limit (IPv4)
1,000
Prefix Limit (IPv6)
1,000
Country
🇺🇸 US
RIR
ARIN
Status
assigned
Allocated
2004-12-30

Routing hygiene

Score 29/100 · Medium risk
RPKI ROA coverage
96%
5 prefixes RPKI invalid
IRR route objects
46.5%
303 prefixes registered for another origin
Hijack signals
4
4 announced against others' ROAs, 0 own announced by others
Upstreams
2
diversity 0/100
  • Routes concentrated on one upstream (100% of routes)
  • 53% of announced prefixes (306 of 572) have no IRR route object for this ASN
  • Announces 4 prefixes that RPKI assigns to another network (possible hijack or misconfiguration)
  • 7 prefixes registered in IRR route objects for another active network and not authorized by a ROA
  • 4% of announced prefixes (23 of 572) have no valid ROA, 5 of them RPKI invalid

Based on 572 announced prefixes, updated daily (2026-10-26). How the score works · RPKI explained

Announced Prefixes

(BGP)572
|
Prefix
RPKI
IRR
Last Seen
23.25.0.0/18
 Valid--
23.177.32.0/24
No ROA--
24.1.0.0/16
 Valid--
24.12.0.0/14
 Valid--
24.104.47.0/24
 Valid--
24.153.88.0/23
 Valid--
50.73.96.0/19
 Valid--
50.76.64.0/19
 Valid--
50.76.240.0/20
 Valid--
50.77.128.0/18
 Valid--
1-10 of 572
1 / 58

Allocated Prefixes

(RIR)6
Prefix
Country
RIR
Status
23.177.32.0/24🇺🇸 USARINallocated
192.137.57.0/24🇺🇸 USARINallocated
192.231.230.0/24🇺🇸 USARINallocated
204.68.241.0/24🇺🇸 USARINallocated
205.167.202.0/23🇺🇸 USARINallocated
209.153.0.0/18🇺🇸 USARINallocated

All 572 announced prefixes of AS33491 →

Downstream Customers(1)

ASNName
AS22187🇺🇸RAULAND-BORG - Rauland-Borg Corporation

BGP Neighbours

(seen in AS paths)

Upstreams (2)

Networks AS33491 hands its own prefixes to: transit providers, or peers at an exchange.

  • AS7922Comcast Cable Communications571
  • AS3356Level 3 Parent1

Downstreams (100 of 143)

Networks whose own prefixes AS33491 passes on: usually its customers.

  • AS14858Hanson Information Systems, . / Family Net17
  • AS19265Memorial Medical Center14
  • AS27482American Eagle Computer Products7
  • AS13950DLS Internet Services6
  • AS40038Moraine Valley Community College6
  • AS7968Loyola University Chicago5
  • AS26912Northwest Community Hospital5
  • AS33248City Of Evanston, Illinois5
  • AS36319NorthShore University HealthSystem5
  • AS19065Levi, Ray & Shoup4
  • AS32143The Village Of Niles4
  • AS396021Comcast Cable Communications4
  • AS10425-3
  • AS19690Hyatt Corporation3
  • AS19855Masergy Communications3
  • AS20310Illinois Tool Works3
  • AS23494Blue Cross Blue Shield Of Illinois Or Blue Cross Blue Shield Of Texas3
  • AS29817LAKE CITY BANK3
  • AS36373Community Hospitals, Indianapolis3
  • AS54056Packaging Corporation Of America3
  • AS54583American College Of Surgeons3
  • AS395490County Of Lake3
  • AS4917AMDOCS2
  • AS6479McHenryCom Company2
  • AS12250EDWARD HEALTH SERVICE2
  • AS13744TYNDALE HOUSE PUBLISHERS2
  • AS13953Sauk Valley Community College2
  • AS15337Wm. Rainey Harper College2
  • AS16593First Merchants Corporation2
  • AS17091Hollister Incorporated2
  • AS20315McHenry County2
  • AS21798International Truck And Engine2
  • AS22187Rauland Borg Corporation2
  • AS26255Oakton Community College2
  • AS26840Advanced Business Group2
  • AS27562Presence Health Network2
  • AS30553Thorek Memorial Hospital2
  • AS32528ROSS PRODUCTS DIVISION2
  • AS33331Valid USA2
  • AS36040Google2
  • AS36478Alliant Credit Union2
  • AS40668Fenwal2
  • AS40801Lewis University2
  • AS54201We Link Networks2
  • AS54971Brown Technologies2
  • AS54997Purdue University2
  • AS55037Busey Bank2
  • AS393323Waterfurnace International2
  • AS394845REMPREX2
  • AS396247Adlai E. Stevenson High School2
  • AS396831-2
  • AS396995Morris Hospital2
  • AS398421Southwest Allen County Schools2
  • AS400236East Allen County Schools2
  • AS1777Saint Xavier University1
  • AS4912CENTIER BANK1
  • AS7380Avant1
  • AS11632American Society Of Plastic Surgeons1
  • AS13430DC COMPUTERS1
  • AS13983ALE Solutions1
  • AS14046Indiana Telephone Network1
  • AS14355Interstate Warehousing1
  • AS14711INGERSOLL CUTTING TOOL COMPANY1
  • AS16706NORTHEAST ORTHOPAEDIC CLINIC, LLP1
  • AS17010Hoosier Energy Rural Electric Cooperative1
  • AS17196College Of DuPage1
  • AS18743MENNONITE MUTUAL AID1
  • AS18784McDonald'S Corporation1
  • AS19131Living Essentials1
  • AS19941Concordia University Chicago1
  • AS20429Guitar Center1
  • AS20441SAGILITY1
  • AS20452BALL STATE UNIVERSITY1
  • AS22034MCMASTER CARR SUPPLY COMPANY1
  • AS25712Computer Services1
  • AS25716Trane Technologies Company1
  • AS26028Panduit1
  • AS26450CTDI1
  • AS26532Mac Lean Fogg Company1
  • AS26541GuavaTech1
  • AS26966Spraying Systems1
  • AS27004Star Financial Bank1
  • AS27289-1
  • AS27358TRUSTMARK INSURANCE1
  • AS27369Swedish Covenant Hospital1
  • AS29891National Cable Communications1
  • AS30302ASPEN DENTAL MANAGEMENT1
  • AS30573Old Second Bancorp1
  • AS32304Natus Medical1
  • AS32321NEWARK NET1
  • AS32649FRANKLIN ELECTRIC1
  • AS32985Follett Content1
  • AS33461COMMUNITY FOUNDATION OF NW INDIANA1
  • AS35928BECKMAN COULTER1
  • AS36460Watts Water Technologies1
  • AS36528-1
  • AS40293BENEDICTINE UNIVERSITY1
  • AS40417Interactions Corporation1
  • AS40520Saint Bernard Hospital1
  • AS40710College Of Lake County1

Other adjacent networks (1)

Adjacent to AS33491 in the transit part of AS paths: peers, providers or customers.

Transfer History

Registry transfers of AS33491 between organisations.

1
ASPA
No ASPA0 upstreams, 1 downstream
Listed as Upstream Provider by
1 ASN
View full ASPA details →
External Links
ARIN WhoisRIPEstat

Learn more

API
Open
GEThttps://api.ipctl.io/v1/asn/33491

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/33491" | jq