rirtracker

IPv4 range · 2,048 addresses

121.50.168.0/21

Now

APNIC statistics
Allocated (dated 2015-11-17), allocated (dated 2026-10-02) (BD, ID, VN), in the latest file
Registry
APNIC
Holder
Not looked up
From
APNIC's latest statistics

Latest change

Released Released from hold (APNIC lists it as 'available')

Reported
2015-10-28 (APNIC)
Confidence
Strong inference
Inventory
APNIC's statistics now list it as 'available'; reissue not confirmed

Timeline (4)

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.

2015-10-28 APNIC Released Released from hold (APNIC lists it as 'available') Strong inference
Statistics
121.50.168.0/21 reserved on 2015-10-28, available on 2015-10-29
Inventory
APNIC's statistics now list it as 'available'; reissue not confirmed

APNIC's statistics show it reserved on 2015-10-28 and available on 2015-10-29. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2011-01-21, 1741 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed.

Evidence (3) · classifier 1.4.0,
  1. Statistics Found by comparing APNIC's daily statistics: 121.50.168.0/21 reserved on 2015-10-28, available on 2015-10-29 source · retrieved
  2. Before APNIC delegated statistics 2015-10-28, before the change: reserved source · retrieved
  3. After APNIC delegated statistics 2015-10-29, after the change: available source · retrieved
Classification history for this change (4 versions)
  1. : Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.0)
  2. : Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.1)
  3. : Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.2)
  4. : Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.4.0) current
2011-01-21 APNIC − Deregistered Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Statistics
121.50.168.0/21 allocated on 2011-01-21, available on 2011-01-22
Inventory
Possible future reissue candidate after hold

Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 2011-01-07) on 2011-01-21 and available on 2011-01-22. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Found by comparing APNIC's daily statistics: 121.50.168.0/21 allocated on 2011-01-21, available on 2011-01-22 source · retrieved
  2. Before APNIC delegated statistics 2011-01-21, before the change: allocated (dated 2011-01-07) source · retrieved
  3. After APNIC delegated statistics 2011-01-22, after the change: available 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
2011-01-07 APNIC + Registered Apparent reissuance of previously removed resource Strong inference
Statistics
121.50.168.0/21 available on 2011-01-07, allocated on 2011-01-08
Inventory
Likely issued from APNIC-controlled inventory

No transfer record matches. APNIC's statistics show it available on 2011-01-07 and allocated (dated 2011-01-07) on 2011-01-08. The tracker saw this range removed from registration on 2008-10-31 (121.50.168.0/21), so it appears to have been issued again from APNIC's pool.

Evidence (3) · classifier 1.4.0,
  1. Statistics Found by comparing APNIC's daily statistics: 121.50.168.0/21 available on 2011-01-07, allocated on 2011-01-08 source · retrieved
  2. Before APNIC delegated statistics 2011-01-07, before the change: available source · retrieved
  3. After APNIC delegated statistics 2011-01-08, after the change: allocated (dated 2011-01-07) source · retrieved
Classification history for this change (4 versions)
  1. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.0)
  2. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.1)
  3. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.2)
  4. : Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2008-10-31 APNIC − Deregistered Removed (return, revocation or reclamation not publicly distinguishable) Observed only
Statistics
121.50.168.0/21 allocated on 2008-10-31, not listed on 2008-11-01
Inventory
Possible future reissue candidate after hold

Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 2007-10-04) on 2008-10-31 and not listed on 2008-11-01. Being gone from APNIC's statistics entirely can also mean it moved to another registry. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Found by comparing APNIC's daily statistics: 121.50.168.0/21 allocated on 2008-10-31, not listed on 2008-11-01 source · retrieved
  2. Before APNIC delegated statistics 2008-10-31, before the change: allocated (dated 2007-10-04) source · retrieved
  3. After APNIC delegated statistics 2008-11-01, after the change: not listed source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.4.0) current

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2026-10-02APNIC121.50.168.0/23+ RegisteredApparent reissuance
2026-10-02APNIC121.50.170.0/23+ RegisteredApparent reissuance
2022-05-18APNIC121.50.168.0/22ReleasedHold released
2021-05-14APNIC121.50.168.0/22− DeregisteredRemoved
2015-11-17APNIC121.50.172.0/22+ RegisteredApparent reissuance
2015-11-16APNIC121.50.168.0/22+ RegisteredApparent reissuance

Transfer records

No transfer log has a transfer of any part of this IPv4 range.

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/121.50.168.0-121.50.175.255.json