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 253
QWEST CORPORATION 141
T-MOBILE USA, INC. 77
ONVOY, LLC - WA 49
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 48
NEW CINGULAR WIRELESS PCS, LLC 35
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
2021-02-02 253-366 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E TACOMA WA
2020-10-22 253-523 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E TACOMAWVLY WA
2020-10-22 253-553 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E AUBURN WA
2020-10-20 253-361 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2020-10-20 253-368 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2020-10-12 253-342 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2020-09-22 253-352 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E TACOMA WA
2020-07-15 253-339 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2020-07-14 253-900 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H GIG HARBOR WA
2020-05-28 253-338 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2020-04-20 253-319 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F TACOMA WA
2020-03-18 253-316 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2020-01-14 253-317 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2019-10-31 253-264 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUMNER WA
2019-10-30 253-281 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
2019-05-16 253-800 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H TACOMA WA
2019-04-17 253-325 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMAWVLY WA
2019-02-15 253-294 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J AUBURN WA
2019-01-29 253-393 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2018-10-23 253-527 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2018-04-06 253-525 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GIG HARBOR WA
2018-04-05 253-993 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMAWVLY WA
2017-12-11 253-290 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
2017-11-10 253-300 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E TACOMA WA
2017-03-29 253-331 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 TACOMAWVLY WA
2017-02-22 253-999 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H TACOMA WA
2016-08-11 253-287 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2016-06-29 253-409 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F AUBURN WA
2016-05-12 253-257 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2016-04-01 253-240 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2016-03-10 253-285 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E AUBURN WA
2016-01-21 253-433 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2016-01-15 253-260 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2016-01-13 253-392 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2015-11-23 253-201 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E TACOMA WA
2015-10-14 253-263 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2015-06-15 253-457 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2015-05-18 253-844 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TACOMA WA
2015-05-12 253-533 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E TACOMA WA
2014-09-23 253-258 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2014-09-18 253-455 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2014-01-14 253-259 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2014-01-09 253-391 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2013-12-19 253-213 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2013-12-18 253-328 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2013-10-24 253-371 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TACOMA WA
2013-06-11 253-244 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2013-03-26 253-204 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E AUBURN WA
2012-10-03 253-625 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
2012-06-07 253-545 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9638 AUBURN 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.