rirtracker

IPv4 range · 256 addresses

104.251.121.0/24

Now

ARIN statistics
Allocated (dated 2026-11-09) (US), in the latest file
Registry
ARIN
Holder
National Association for Public Health Statistics and Information Systems NAPHSIS
From
RDAP, looked up 2026-11-11 18:20 UTC

Latest change

+ Add Intra-ARIN transfer

Reported
2026-11-09 (ARIN)
Confidence
Confirmed Provisional
Inventory
No effect on ARIN applicant inventory

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.

2026-11-09 ARIN + Add Intra-ARIN transfer Confirmed Provisional
ARIN-Issued
Add 104.251.121.0-104.251.121.255
From
1st Class Hosting, LLC ARIN
To
National Association for Public Health Statistics and Information Systems ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a transfer from 1st Class Hosting, LLC (ARIN) to National Association for Public Health Statistics and Information Systems (ARIN) on 2026-11-09 19:27 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.

Evidence (4) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2026-11-09: "Add 104.251.121.0-104.251.121.255" source · retrieved
  2. Transfer log Transfer log: RESOURCE_TRANSFER on 2026-11-09 19:27 UTC, 1st Class Hosting, LLC (ARIN) to National Association for Public Health Statistics and Information Systems (ARIN); resources moved: 104.251.121.0/24 source · retrieved
  3. Before ARIN delegated statistics 2026-11-08 (produced 2026-11-08T14:00:21+00:00), before the report: allocated (dated 2014-12-19) source · retrieved
  4. After ARIN delegated statistics 2026-11-10 (produced 2026-11-10T14:00:21+00:00), after the report: allocated (dated 2026-11-09) source · retrieved

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2014-12-19ARIN104.251.112.0/20+ AddApparent new issuance
2014-12-19ARIN104.251.112.0/20− RemoveARIN pool record

Transfer records (1)

Date (UTC)LogTypeRange movedFromTo
ARINResource transfer104.251.121.0/24 1st Class Hosting, LLC ARINNational Association for Public Health Statistics and Information Systems 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

Looked upWhyRegistryHandleOrganizationStatusLast changed
After 24 hours ARINNET-104-251-121-0-1National Association for Public Health Statistics and Information Systems NAPHSISactive2026-11-09
First seen ARINNET-104-251-121-0-1National Association for Public Health Statistics and Information Systems NAPHSISactive2026-11-09

Organization-level details only; contact details are never kept. RDAP shows the registration when it was looked up, not in the past.

This page as data: ip/104.251.121.0-104.251.121.255.json