NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 309
STRATUS NETWORKS 21
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-03-18 309-870 0XXX1XXX2XXX3XXX · 4 holders which blocks → STRATUS NETWORKS 495J CROPSEY IL
2021-03-18 309-878 0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → STRATUS NETWORKS 495J COOKSVILLE IL
2021-02-02 309-858 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → STRATUS NETWORKS 495J BIGGSVILLE IL
2021-02-02 309-859 1XXX3XXX5XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J GULFPORT IL
2020-11-20 309-841 0XXX1XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J ELIZA IL
2020-09-17 309-804 1XXX4XXX · 2 holders which blocks → STRATUS NETWORKS 495J SEATON IL
2020-09-17 309-805 1XXX5XXX · 2 holders which blocks → STRATUS NETWORKS 495J RIO IL
2020-09-17 309-806 0XXX1XXX3XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J LITTLEYORK IL
2020-09-17 309-812 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → STRATUS NETWORKS 495J CARLOCK IL
2020-09-17 309-813 1XXX8XXX · 2 holders which blocks → STRATUS NETWORKS 495J BELLFLOWER IL
2020-07-28 309-773 1XXX2XXX3XXX7XXX · 3 holders which blocks → STRATUS NETWORKS 495J HAMPTON IL
2020-07-22 309-719 1XXX8XXX · 2 holders which blocks → STRATUS NETWORKS 495J GALESBURG IL
2020-07-15 309-718 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → STRATUS NETWORKS 495J BLOOMINGTN IL
2020-07-14 309-709 1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → STRATUS NETWORKS 495J MANITO IL
2020-07-10 309-632 0–9 XXXall 10 · 7 holders which blocks → STRATUS NETWORKS 495J DELAVAN IL
2020-07-10 309-638 1XXX8XXX · 2 holders which blocks → STRATUS NETWORKS 495J GALVA IL
2020-07-10 309-656 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J SOUTHPEKIN IL
2020-07-10 309-701 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J SPRING BAY IL
2020-07-10 309-704 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J TRIVOLI IL
2020-07-08 309-619 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHILLICOTH IL
2020-03-03 309-570 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J PEORIA IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.