This data was last updated ago, at 2026-10-09 21:19 UTC. The site normally updates once a day, so the latest update didn't finish; recent changes may be missing.
IPv4 range · 256 addresses
204.13.51.0/24
Now
ARIN statistics
Reserved on 2026-10-09
Registry
Not known
Holder
Not looked up
Latest change
Not in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)
Possible reissue candidate; not confirmed available.
Timeline since 2026-01-01 (3)
2026-08-10Not in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Earliest estimated hold expiration 2026-10-09. 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 allocated (dated 2026-01-13) on 2026-08-09 and reserved on 2026-08-11. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 for 60 days before reissuing them, so the earliest estimated hold expiration is 2026-10-09. This does not confirm availability.
Evidence (3) · classifier 1.0.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 204.13.51.0/24 allocated on 2026-08-10, reserved on 2026-08-11source · retrieved
BeforeARIN delegated statistics 2026-08-09 (produced 2026-08-09T13:00:21+00:00), before the report: allocated (dated 2026-01-13)source · retrieved
AfterARIN delegated statistics 2026-08-11 (produced 2026-08-11T13:00:21+00:00), after the report: reservedsource · retrieved
2026-01-13+ AddApparent new issuanceStrong inference
ARIN-Issued
Add 204.13.51.0-204.13.51.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.
Evidence (3) · classifier 1.0.0,
ARIN-IssuedARIN-Issued report for 2026-01-13: "Add 204.13.51.0-204.13.51.255"source · retrieved
BeforeARIN delegated statistics 2026-01-12 (produced 2026-01-12T14:00:47+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2026-01-14 (produced 2026-01-14T14:00:47+00:00), after the report: allocated (dated 2026-01-13)source · retrieved
2026-01-13− RemoveChange to ARIN's own pool recordStrong inference
ARIN-Issued
Remove 204.13.51.0-204.13.51.255
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2026-01-12 and allocated (dated 2026-01-13) on 2026-01-14. ARIN removed its own pool record for this range as part of issuing it: the same report adds 204.13.51.0-204.13.51.255. The issuance is explained on that line.
Evidence (3) · classifier 1.0.0,
ARIN-IssuedARIN-Issued report for 2026-01-13: "Remove 204.13.51.0-204.13.51.255"source · retrieved
BeforeARIN delegated statistics 2026-01-12 (produced 2026-01-12T14:00:47+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2026-01-14 (produced 2026-01-14T14:00:47+00:00), after the report: allocated (dated 2026-01-13)source · retrieved
Transfer records (1)
Date (UTC)
Type
Range moved
From
To
Resource transfer
204.13.51.0/24
Dynamic ASP Inc. ARIN
Cloud A ARIN
Every record in ARIN's transfer log that moved any part of this IPv4 range, back to 2009.
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.