NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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, last 30 days
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 253-530 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 GIG HARBOR WA
— 253-531 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-532 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 732J TACOMA WA
— 253-534 5XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-535 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-536 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-537 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-538 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-539 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-540 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-541 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-548 4XXX5XXX6XXX7XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-549 1XXX9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 GIG HARBOR WA
— 253-550 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-552 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WA
— 253-559 not yet reported which blocks → ONVOY, LLC - WA 483E GRAHAM WA
— 253-561 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AUBURN WA
— 253-563 not yet reported which blocks → ONVOY, LLC - WA 483E DES MOINES WA
— 253-564 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-565 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-566 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-568 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-569 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
— 253-571 8XXX9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-572 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-573 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-576 0XXX which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-579 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-581 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-582 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-583 4XXX6XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-584 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-588 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-589 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-590 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-591 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-592 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-593 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-594 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-595 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-596 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-597 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-606 none assigned yet which blocks → METROPCS, INC. 5562 TACOMA WA
— 253-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-617 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-627 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-630 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-631 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-638 4XXX5XXX which blocks → QWEST CORPORATION 9638 KENT WA

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.