NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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, last 30 days — NPA 531
MIDSTATES DATA TRANSPORT, LLC - NE 1
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
2015-08-12 531-203 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2015-03-10 531-600 0–9 XXXall 10 · 5 holders which blocks → ALLO COMMUNICATIONS LLC 907K OMAHA NE
2013-02-13 531-333 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LINCOLN NE
— 531-202 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H OAKLAND NE
— 531-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-213 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OMAHA NE
— 531-217 0–9 XXXall 10 · 9 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLATTSMTH NE
— 531-244 0XXX1XXX2XXX4XXX6XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PLATTSMTH NE
— 531-248 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LINCOLN NE
— 531-283 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
— 531-284 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J OMAHA NE
— 531-289 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LINCOLN NE
— 531-299 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J OMAHA NE
— 531-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-347 not yet reported which blocks → NE
— 531-378 not yet reported which blocks → NE
— 531-383 not yet reported which blocks → NE
— 531-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-444 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OMAHA NE
— 531-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NE
— 531-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-622 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J OMAHA NE
— 531-667 not yet reported which blocks → NE
— 531-700 not yet reported which blocks → NE
— 531-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-739 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 LINCOLN NE
— 531-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NE
— 531-950 not yet reported which blocks → NE
— 531-958 not yet reported which blocks → NE
— 531-959 not yet reported which blocks → NE
— 531-976 not yet reported which blocks → NE

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.