148.168.0.0/16

Currently announced jointly by AS7068 Pfizer Inc., AS11971 Pfizer Inc., in the routed prefix 148.168.0.0/16.

Current ASN: AS7068 AS11971; Pfizer Inc.
Routed prefix: 148.168.0.0/16; Most specific route covering this prefix
ASNs over time: 2; 2 announcement records
RIR allocation: ARIN; United States · 148.168.0.0/16

Routing data · Nov 1, 2026, 22:23 UTC

ASN historyEvery routed prefix covering 148.168.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
148.168.0.0/16	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.0.0/16	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing

More specific routes19 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
148.168.32.0/19	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.35.0/24	AS7068	Pfizer Inc.	United States	2026-10-29 22:21	2026-11-01 22:23	Announcing
148.168.35.0/24	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.64.0/24	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.76.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.76.0/24	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.77.0/24	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.80.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.82.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.96.0/19	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.96.0/24	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.99.0/24	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.100.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.102.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.104.0/23	AS7068	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.192.0/22	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.192.0/23	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.216.0/23	AS36393	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing
148.168.224.0/22	AS11971	Pfizer Inc.	United States	Before monitoring	2026-11-01 22:23	Announcing

Change logAll changes

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

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RIR allocation record

Registry: ARIN
Allocated block: 148.168.0.0/16
Country: United States
Allocation date: 1991-05-09
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.