rirtracker

IPv4 range · 65,536 addresses

158.51.0.0/16

Now

ARIN statistics
Allocated (99 records, dated 2020-01-03 to 2026-10-30), reserved (1 record) (CA, JP, US), in the latest file
Registry
Not known
Holder
Not looked up

Latest change

− Remove Unresolved change

Reported
2011-08-17 (ARIN)
Confidence
Observed only
Inventory
Inventory effect unknown

Hold

Removed
2011-02-07 (ARIN)
Estimated hold end
2011-04-08 (from ARIN's published rule)

Timeline (2)

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.

2011-08-17 ARIN − Remove Unresolved change Observed only
ARIN-Issued
Remove 158.51.0.0-158.51.255.255
Inventory
Inventory effect unknown

ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2011-08-16 and not issued on 2011-08-18. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2011-08-17: "Remove 158.51.0.0-158.51.255.255" source · retrieved
  2. Before ARIN delegated statistics 2011-08-16, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2011-08-18, after the report: not issued source · retrieved
Classification history for this change (4 versions)
  1. : Unresolved change, observed only (classifier 1.3.0)
  2. : Unresolved change, observed only (classifier 1.3.1)
  3. : Unresolved change, observed only (classifier 1.3.2)
  4. : Unresolved change, observed only (classifier 1.4.0) current
2011-02-07 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2011-04-08. Possible reissue candidate after this date; not confirmed available.

Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it assigned (dated 1992-02-14) on 2011-02-06 and not issued on 2011-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2011-04-08. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 158.51.0.0/16 assigned on 2011-02-07, not listed on 2011-02-08 source · retrieved
  2. Before ARIN delegated statistics 2011-02-06, before the report: assigned (dated 1992-02-14) source · retrieved
  3. After ARIN delegated statistics 2011-02-08, after the report: not issued source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2026-10-30ARIN158.51.155.0/24+ AddIntra-ARIN transfer
2026-08-28ARIN158.51.50.0/23Transfer logMerger/acquisition
2026-08-14ARIN158.51.0.0/23Transfer logMerger/acquisition
2026-08-10ARIN158.51.176.0/24Not in ARIN-IssuedRemoved
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
2025-04-03ARIN158.51.91.0/24+ AddApparent reissuance
2025-04-03ARIN158.51.91.0/24− RemoveARIN pool record
2025-03-26ARIN158.51.4.0/22Transfer logMerger/acquisition
2024-11-18ARIN158.51.80.0/22Transfer logMerger/acquisition
2024-04-29ARIN158.51.196.0/23Transfer logMerger/acquisition
2024-04-11ARIN158.51.138.0/23Transfer logMerger/acquisition
2023-08-22ARIN158.51.52.0/22Transfer logMerger/acquisition
2023-08-08ARIN158.51.244.0/22Transfer logMerger/acquisition
2023-07-10ARIN158.51.91.0/24Not in ARIN-IssuedRemoved
2023-05-09ARIN158.51.232.0/22Transfer logMerger/acquisition
2023-01-13ARIN158.51.201.0/24+ AddApparent reissuance
2023-01-13ARIN158.51.201.0/24− RemoveARIN pool record
2022-06-06ARIN158.51.201.0/24Not in ARIN-IssuedRemoved
2022-01-06ARIN158.51.164.0/22Transfer logMerger/acquisition
2021-12-27ARIN158.51.144.0/22Transfer logMerger/acquisition
2021-10-04ARIN158.51.50.0/23Not in ARIN-IssuedRemoved
2021-03-26ARIN158.51.80.0/22Transfer logMerger/acquisition
2020-06-15ARIN158.51.208.0/24+ AddApparent reissuance
2020-06-15ARIN158.51.208.0/24− RemoveARIN pool record
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
2020-03-25ARIN158.51.208.0/24− RemoveNo material change
2020-03-02ARIN158.51.176.0/24+ AddApparent reissuance
2020-03-02ARIN158.51.176.0/24− RemoveARIN pool record
2020-02-18ARIN158.51.91.0/24+ AddApparent reissuance
2020-02-18ARIN158.51.91.0/24− RemoveARIN pool record
2020-02-18ARIN158.51.200.0/24+ AddApparent reissuance
2020-02-18ARIN158.51.200.0/24− RemoveARIN pool record
2020-02-18ARIN158.51.209.0/24+ AddApparent reissuance
2020-02-18ARIN158.51.209.0/24− RemoveARIN pool record
2020-02-14ARIN158.51.241.0/24+ AddApparent reissuance
2020-02-14ARIN158.51.241.0/24− RemoveARIN pool record
2020-02-13ARIN158.51.242.0/24+ AddApparent reissuance
2020-02-13ARIN158.51.242.0/24− RemoveARIN pool record
2020-02-11ARIN158.51.198.0/23+ AddApparent reissuance
2020-02-11ARIN158.51.198.0/23− RemoveARIN pool record
2020-02-06ARIN158.51.243.0/24+ AddApparent reissuance
2020-02-06ARIN158.51.243.0/24− RemoveARIN pool record
2020-02-04ARIN158.51.132.0/23+ AddApparent reissuance
2020-02-04ARIN158.51.132.0/23− RemoveARIN pool record
2020-02-03ARIN158.51.90.0/24+ AddApparent reissuance
2020-02-03ARIN158.51.90.0/24− RemoveARIN pool record
2020-02-03ARIN158.51.232.0/22+ AddApparent reissuance
2020-02-03ARIN158.51.232.0/22− RemoveARIN pool record
2020-02-03ARIN158.51.240.0/24+ AddApparent reissuance
2020-02-03ARIN158.51.240.0/24− RemoveARIN pool record
2020-01-31ARIN158.51.90.0/23− RemoveNo material change
2020-01-29ARIN158.51.250.0/23+ AddApparent reissuance
2020-01-29ARIN158.51.250.0/23− RemoveARIN pool record
2020-01-27ARIN158.51.248.0/23+ AddApparent reissuance
2020-01-27ARIN158.51.248.0/23− RemoveARIN pool record
2020-01-24ARIN158.51.164.0/22+ AddApparent reissuance

Transfer records (16)

Date (UTC)LogTypeRange movedFromTo
ARINResource transfer158.51.155.0/24 Crossroads Broadband of Indiana, Inc ARINTekion ARIN
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 acquisition158.51.196.0/23 HC Technologies, LLC ARINGTS Securities, LLC ARIN
ARINMerger acquisition158.51.138.0/23 Sureline Telecom ARINGorge Networks Inc. ARIN
ARINMerger acquisition158.51.52.0/22 Redbird Communications Inc ARINFlexNetworks ARIN
ARINMerger acquisition158.51.244.0/22 Fastnet Communications ARINFlexNetworks ARIN
ARINMerger acquisition158.51.232.0/22 Gemalto, Inc. ARINThales DIS USA, Inc. ARIN
ARINMerger acquisition158.51.164.0/22 HAUG COMMUNICATIONS ARINKwiKom Communications ARIN
ARINMerger acquisition158.51.144.0/22 GBTCloud Inc ARINQuickPacket, LLC 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.

This page as data: ip/158.51.0.0-158.51.255.255.json