rirtracker

IPv4 range · 4 prefixes · 23,040 addresses

158.51.0.0 - 158.51.89.255

158.51.0.0/18, 158.51.64.0/20, 158.51.80.0/21, 158.51.88.0/23

Now

ARIN statistics
Allocated (dated 2020-01-03), allocated (dated 2020-01-06), allocated (dated 2020-01-07), allocated (dated 2020-01-08), allocated (dated 2020-01-09), allocated (dated 2020-05-26), allocated (dated 2025-08-11) (CA, US), in the latest file
Registry
ARIN
Holder
Not looked up
From
ARIN's latest statistics

Latest change

− Remove Change to ARIN's own pool record

Reported
2020-01-03 (ARIN)
Confidence
Strong inference
Inventory
Part of the issuance reported the same day

Timeline (1)

Every change the tracker has found, newest first. It covers ARIN from 2008-12-01, the RIPE NCC from 2010-04-23, APNIC from 2008-02-15, LACNIC from 2012-06-29 and AFRINIC from 2012-10-03.

2020-01-03 ARIN − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 158.51.0.0-158.51.89.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2020-01-02 and allocated (dated 2020-01-03), reserved on 2020-01-04. ARIN removed its own pool record for this range as part of issuing it: the same report adds 158.51.0.0-158.51.1.255, 158.51.2.0-158.51.3.255, 158.51.4.0-158.51.7.255, 158.51.8.0-158.51.8.255 and 18 more. The issuance is explained on those lines.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2020-01-03: "Remove 158.51.0.0-158.51.89.255" source · retrieved
  2. Before ARIN delegated statistics 2020-01-02 (produced 2020-01-02T15:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2020-01-04 (produced 2020-01-04T15:00:09+00:00), after the report: allocated (dated 2020-01-03), reserved source · retrieved
Classification history for this change (4 versions)
  1. : Change to ARIN's own pool record, strong inference (classifier 1.3.0)
  2. : Change to ARIN's own pool record, strong inference (classifier 1.3.1)
  3. : Change to ARIN's own pool record, strong inference (classifier 1.3.2)
  4. : Change to ARIN's own pool record, strong inference (classifier 1.4.0) current

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2026-08-28ARIN158.51.50.0/23Transfer logMerger/acquisition
2026-08-14ARIN158.51.0.0/23Transfer logMerger/acquisition
2025-10-30ARIN158.51.64.0/23Transfer logMerger/acquisition
2025-08-11ARIN158.51.72.0/22+ AddIntra-ARIN transfer
2025-06-12ARIN158.51.0.0/23Transfer logMerger/acquisition
2025-03-26ARIN158.51.4.0/22Transfer logMerger/acquisition
2024-11-18ARIN158.51.80.0/22Transfer logMerger/acquisition
2023-08-22ARIN158.51.52.0/22Transfer logMerger/acquisition
2021-10-04ARIN158.51.50.0/23Not in ARIN-IssuedRemoved
2021-03-26ARIN158.51.80.0/22Transfer logMerger/acquisition
2020-05-26ARIN158.51.88.0/23+ AddApparent reissuance
2020-05-26ARIN158.51.88.0/23− RemoveARIN pool record
2020-03-25ARIN158.51.88.0/23− RemoveNo material change
2020-01-09ARIN158.51.9.0/24+ AddApparent reissuance
2020-01-09ARIN158.51.9.0/24− RemoveARIN pool record
2020-01-09ARIN158.51.64.0/23+ AddApparent reissuance
2020-01-09ARIN158.51.64.0/23− RemoveARIN pool record
2020-01-08ARIN158.51.36.0/22+ AddApparent reissuance
2020-01-08ARIN158.51.36.0/22− RemoveARIN pool record
2020-01-07ARIN158.51.10.0/24+ AddApparent reissuance
2020-01-07ARIN158.51.10.0/24− RemoveARIN pool record
2020-01-07ARIN158.51.79.0/24+ AddApparent reissuance
2020-01-07ARIN158.51.79.0/24− RemoveARIN pool record
2020-01-06ARIN158.51.12.0/22+ AddApparent reissuance
2020-01-06ARIN158.51.12.0/22− RemoveARIN pool record
2020-01-06ARIN158.51.44.0/22+ AddApparent reissuance
2020-01-06ARIN158.51.44.0/22− RemoveARIN pool record
2020-01-06ARIN158.51.84.0/22+ AddApparent reissuance
2020-01-06ARIN158.51.84.0/22− RemoveARIN pool record
2020-01-03ARIN158.51.0.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.2.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.4.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.8.0/24+ AddApparent reissuance
2020-01-03ARIN158.51.11.0/24+ AddApparent reissuance
2020-01-03ARIN158.51.16.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.20.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.24.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.28.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.32.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.40.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.48.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.50.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.52.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.56.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.60.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.66.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.68.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.72.0/22+ AddApparent reissuance
2020-01-03ARIN158.51.76.0/23+ AddApparent reissuance
2020-01-03ARIN158.51.78.0/24+ AddApparent reissuance
2020-01-03ARIN158.51.80.0/22+ AddApparent reissuance
2011-08-17ARIN158.51.0.0/16− RemoveUnresolved
2011-02-07ARIN158.51.0.0/16Not in ARIN-IssuedRemoved

Transfer records (9)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition158.51.50.0/23 VURGE INC. ARINARROW DATACENTERS INC ARIN
ARINMerger acquisition158.51.0.0/23 The Internet Company Limited Partnership ARINARROW DATACENTERS INC ARIN
ARINMerger acquisition158.51.64.0/23 Area 1 Security, Inc. ARINCloudflare, Inc. ARIN
ARINResource transfer158.51.72.0/22 TNEXT Communication Inc ARINTechMinds Enterprise Inc. ARIN
ARINMerger acquisition158.51.0.0/23 The Internet Company Limited Partnership ARINThe Internet Company Limited Partnership ARIN
ARINMerger acquisition158.51.4.0/22 Celerity Networks LLC ARINGallatin Wireless Internet, LLC ARIN
ARINMerger acquisition158.51.80.0/22 Pumpkin Networks, LLC ARINAnother Corporate ISP, LLC ARIN
ARINMerger acquisition158.51.52.0/22 Redbird Communications Inc ARINFlexNetworks ARIN
ARINMerger acquisition158.51.80.0/22 COMMON NETWORKS, INC. ARINPumpkin Networks, LLC ARIN

Every record in the ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC transfer logs that moved any part of this IPv4 range (ARIN's from 2009, the RIPE NCC's from 2012, APNIC's from 2010, LACNIC's from 2016, AFRINIC's from 2018). A transfer between two registries is in both logs.

RDAP lookups

Not looked up. The tracker queries RDAP for changes as they're reported (on first sight, after 24 hours and after seven days); older changes aren't looked up because today's RDAP says nothing about the past.

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