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 314
SOUTHWESTERN BELL 255
NEW CINGULAR WIRELESS PCS, LLC - IL 101
T-MOBILE USA, INC. 94
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 53
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 51
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
— 314-320 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
— 314-321 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-322 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-323 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-324 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-329 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MO 093F MEHLVILLE MO
— 314-330 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-331 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-333 1XXX2XXX9XXX which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
— 314-334 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 OAKVILLE MO
— 314-335 0XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-336 not yet reported which blocks → PAETEC ITEL, LLC 829J CREVECOEUR MO
— 314-340 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-341 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-342 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-344 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-345 0XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-346 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-348 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-351 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-352 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-353 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-355 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-359 6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-360 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-361 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-362 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-363 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-364 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-365 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-367 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-368 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-369 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-371 5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-372 1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-373 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J LADUE MO
— 314-374 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-375 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J OAKVILLE MO
— 314-377 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-378 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-380 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F OAKVILLE MO
— 314-381 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-382 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-383 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-385 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-387 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-388 8XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-389 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-391 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
— 314-392 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 CREVECOEUR MO

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.