2001:559:c0f8::/48

Currently announced jointly by AS33287 Comcast - Freedom West (Philadelphia), AS33659 Comcast - Freedom East (New Jersey), in the routed prefix 2001:559:c0f8::/48.

Current ASN: AS33287 AS33659; Comcast - Freedom West (Philadelphia)
Routed prefix: 2001:559:c0f8::/48; Most specific route covering this prefix
ASNs over time: 3; 3 announcement records
RIR allocation: ARIN; United States · 2001:558::/29

Routing data · Nov 1, 2026, 22:23 UTC

ASN historyEvery routed prefix covering 2001:559:c0f8::/48

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:559:c0f8::/48	AS33287	Comcast - Freedom West (Philadelphia)	United States	Before monitoring	2026-11-01 22:23	Announcing
2001:559:c0f8::/48	AS33659	Comcast - Freedom East (New Jersey)	United States	2026-10-28 06:19	2026-11-01 22:23	Announcing
2001:558::/29	AS7922	Comcast	United States	Before monitoring	2026-11-01 22:23	Announcing

More specific routes0 total

No more specific routes inside this prefix.

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-28 06:19	2001:559:c0f8::/48	Origin added	AS33659	Comcast - Freedom East (New Jersey)	AS33287	United States

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RIR allocation record

Registry: ARIN
Allocated block: 2001:558::/29
Country: United States
Allocation date: 2003-01-06
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.