ARIN Incident Report: IPv4 Address Allocation Error and Resolution
By
immibis
Lightly toasted, lightly seasoned, mostly correct.
Summary
ARIN (American Registry for Internet Numbers) published a public incident report detailing an IPv4 address allocation error that occurred on December 2, 2025. During a 4.10 allocation process, the IPv4 block 23.150.164.0/24, which was correctly allocated to an Original Customer, was inadvertently removed and reissued to a Requesting Customer. The error resulted from ARIN's manual and partially offline 4.10 inventory process. The incorrect allocation persisted for a week until the Original Customer reported the issue on December 9, 2025. ARIN resolved the situation by restoring the original block to the Original Customer and issuing a replacement /24 block to the Requesting Customer.
Key quotes
· 4 pulledOn 2 December 2025, an IPv4 block 23.150.164.0/24, correctly allocated to the Original Customer, was inadvertently removed and reissued to the Requesting Customer during a 4.10 allocation process.
This error stemmed from the current manual and partially offline 4.10 inventory process.
The incorrect state persisted until 9 December 2025, when the Original Customer reported the issue.
ARIN restored the 23.150.164.0/24 to the Original Customer, issued a replacement /24 to the Requesting Customer.
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