NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 534-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WI
— 534-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-636 not yet reported which blocks → WI
— 534-700 not yet reported which blocks → WI
— 534-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-950 not yet reported which blocks → WI
— 534-958 not yet reported which blocks → WI
— 534-959 not yet reported which blocks → WI
— 534-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 539-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-214 0–9 XXXall 10 · 5 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 FAIRFAX OK
— 539-290 0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - OK 409F WUNIONTOWN OK
— 539-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-321 0XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 MORRIS OK
— 539-367 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BROKENARRW OK
— 539-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-449 0XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F PORTER OK
— 539-500 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY, LLC - OK 409F KIEFER OK
— 539-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-538 0XXX1XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F ASHLAND OK
— 539-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 539-600 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - OK 409F HENRYETTA OK
— 539-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-622 0XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F BOYNTON OK
— 539-635 0XXX1XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F SAVANNA OK
— 539-664 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 539-700 not yet reported which blocks → OK
— 539-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-777 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 TULSA OK
— 539-800 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - OK 409F COMMERCE OK
— 539-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-832 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 539-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-950 not yet reported which blocks → OK
— 539-958 not yet reported which blocks → OK
— 539-959 not yet reported which blocks → OK
— 539-976 not yet reported which blocks → OK
— 540-200 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 BLACKSBURG VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.