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
2001-11-20 253-604 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 PUYALLUP WA
2001-11-15 253-632 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2001-11-07 253-878 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
2001-11-06 253-517 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMAWVLY WA
2001-10-23 253-470 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J SUMNER WA
2001-09-28 253-394 1XXX2XXX3XXX4XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J AUBURN WA
2001-09-27 253-345 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J TACOMAWVLY WA
2001-09-27 253-447 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - WA 483E SUMNER WA
2001-08-21 253-347 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2001-08-21 253-441 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
2001-07-30 253-251 4XXX5XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 PUYALLUP WA
2001-07-10 253-250 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMAWVLY WA
2001-05-25 253-310 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 TACOMA WA
2001-04-26 253-315 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2001-04-23 253-620 0XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 TACOMA WA
2001-04-23 253-796 0XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KENT WA
2001-04-23 253-904 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 PUYALLUP WA
2001-04-23 253-929 4XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 AUBURN WA
2001-04-23 253-966 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
2001-04-23 253-967 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
2001-04-23 253-968 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
2001-04-23 253-987 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SUMNER WA
2001-04-16 253-222 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2001-04-16 253-223 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2001-04-16 253-224 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2001-04-16 253-332 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2001-03-30 253-273 0XXX2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2001-03-29 253-214 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 DES MOINES WA
2001-03-29 253-234 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KENT WA
2001-03-20 253-212 5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 TACOMA WA
2001-02-28 253-248 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMAWVLY WA
2001-02-28 253-249 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 AUBURN WA
2001-02-13 253-217 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2001-01-24 253-218 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 AUBURN WA
2001-01-24 253-237 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 DES MOINES WA
2001-01-23 253-233 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-202 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
— 253-203 4XXX5XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J TACOMA WA
— 253-205 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
— 253-206 not yet reported which blocks → WA
— 253-207 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-208 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-209 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-210 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRAHAM WA
— 253-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-216 2XXX3XXX4XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J KENT WA
— 253-219 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-220 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F KENT WA
— 253-221 none assigned yet which blocks → METROPCS, INC. 5562 TACOMAWVLY WA
— 253-225 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR 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.