204.84.0.0/15

Currently announced by AS81 MCNC, in the routed prefix 204.84.0.0/15.

Current ASN: AS81; MCNC
Routed prefix: 204.84.0.0/15; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 204.84.0.0/15

Routing data · Nov 8, 2026, 12:23 UTC

ASN historyEvery routed prefix covering 204.84.0.0/15

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
204.84.0.0/15	AS81	MCNC	United States	Before monitoring	2026-11-08 12:23	Announcing

More specific routes14 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
204.84.4.0/23	AS20197	Castle & Cooke North Carolina, LLC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.6.0/24	AS20197	Castle & Cooke North Carolina, LLC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.7.0/24	AS20197	Castle & Cooke North Carolina, LLC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.8.0/22	AS36850	University of North Carolina at Chapel Hill	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.66.0/24	AS10952	East Carolina University	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.80.0/20	AS81	MCNC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.112.0/21	AS81	MCNC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.120.0/24	AS81	MCNC	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.238.0/23	AS6559	State of NC - State Telecommunications Services	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.244.0/22	AS11442	North Carolina State University	United States	Before monitoring	2026-11-08 12:23	Announcing
204.84.252.0/22	AS36850	University of North Carolina at Chapel Hill	United States	Before monitoring	2026-11-08 12:23	Announcing
204.85.176.0/20	AS36850	University of North Carolina at Chapel Hill	United States	Before monitoring	2026-11-08 12:23	Announcing
204.85.191.0/24	AS36850	University of North Carolina at Chapel Hill	United States	Before monitoring	2026-11-08 12:23	Announcing
204.85.192.0/18	AS81	MCNC	United States	Before monitoring	2026-11-08 12:23	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

Look up another address

RIR allocation record

Registry: ARIN
Allocated block: 204.84.0.0/15
Country: United States
Allocation date: 1994-06-30
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.