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
— 314-246 0XXX1XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-247 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-248 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F MEHLVILLE MO
— 314-249 2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-252 0XXX1XXX2XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-253 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-255 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → XO MISSOURI, INC. 4774 ST LOUIS MO
— 314-259 1XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-260 1XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-261 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-263 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-264 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-265 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-266 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-267 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-268 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-269 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
— 314-270 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 SAPPINGTON MO
— 314-271 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-272 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 SAPPINGTON MO
— 314-275 0XXX which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-276 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-277 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-279 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LADUE MO
— 314-280 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-282 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E ST LOUIS MO
— 314-283 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-284 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-286 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-288 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 KIRKWOOD MO
— 314-289 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-290 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-291 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-292 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 LADUE MO
— 314-293 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 OAKVILLE MO
— 314-294 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-298 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-301 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-302 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-303 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-304 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-306 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-307 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-308 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 314-313 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-315 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MO 093F KIRKWOOD MO
— 314-316 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-317 0XXX which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-318 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS 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.