rirtracker

IPv4 range · 16,384 addresses

143.203.0.0/18

Now

ARIN statistics
Allocated (dated 2026-10-02), allocated (dated 2026-10-06), allocated (dated 2026-10-07), reserved on 2026-10-09 (CA, JP, US)
Registry
Not known
Holder
Not looked up

Latest change

− Remove Change to ARIN's own pool record

Reported
2026-10-02
Confidence
Strong inference
Inventory
Part of the issuance reported the same day

Timeline since 2026-01-01 (1)

2026-10-02 − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 143.203.0.0-143.203.63.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2026-10-01 and allocated (dated 2026-10-02), reserved on 2026-10-03. ARIN removed its own pool record for this range as part of issuing it: the same report adds 143.203.0.0-143.203.3.255, 143.203.16.0-143.203.19.255, 143.203.20.0-143.203.23.255, 143.203.24.0-143.203.27.255 and 8 more. The issuance is explained on those lines.

Evidence (3) · classifier 1.0.0,
  1. ARIN-Issued ARIN-Issued report for 2026-10-02: "Remove 143.203.0.0-143.203.63.255" source · retrieved
  2. Before ARIN delegated statistics 2026-10-01 (produced 2026-10-01T13:00:21+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2026-10-03 (produced 2026-10-03T13:00:22+00:00), after the report: allocated (dated 2026-10-02), reserved source · retrieved

Changes to overlapping ranges

DateRangeARIN actionWhat happened
2026-10-07143.203.12.0/22+ AddApparent reissuance
2026-10-07143.203.12.0/22− RemoveARIN pool record
2026-10-06143.203.4.0/22+ AddApparent reissuance
2026-10-06143.203.4.0/22− RemoveARIN pool record
2026-10-02143.203.0.0/22+ AddApparent new issuance
2026-10-02143.203.16.0/22+ AddApparent new issuance
2026-10-02143.203.20.0/22+ AddApparent new issuance
2026-10-02143.203.24.0/22+ AddApparent new issuance
2026-10-02143.203.28.0/22+ AddApparent new issuance
2026-10-02143.203.36.0/22+ AddApparent new issuance
2026-10-02143.203.40.0/22+ AddApparent new issuance
2026-10-02143.203.44.0/22+ AddApparent new issuance
2026-10-02143.203.48.0/22+ AddApparent new issuance
2026-10-02143.203.52.0/22+ AddApparent new issuance
2026-10-02143.203.56.0/22+ AddApparent new issuance
2026-10-02143.203.60.0/22+ AddApparent new issuance

Transfer records

ARIN's transfer log has no 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/143.203.0.0-143.203.63.255.json