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
2003-04-09 314-225 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2002-11-27 314-200 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MEHLVILLE MO
2002-06-06 314-274 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
2002-03-26 314-262 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
2002-03-19 314-221 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KIRKWOOD MO
2001-12-19 314-456 0XXX2XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2001-12-19 314-467 0XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
2001-11-16 314-733 4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
2001-09-21 314-258 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2001-08-17 314-395 not yet reported which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LADUE MO
2001-08-17 314-452 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2001-05-17 314-256 1XXX2XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
2001-05-17 314-859 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
2001-03-16 314-566 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2001-01-18 314-458 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2001-01-17 314-573 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-204 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-205 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-206 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-209 9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-210 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 314-212 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-213 0XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-214 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-215 1XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-216 0XXX1XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-218 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-219 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-220 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-222 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-223 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-226 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-227 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-228 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F CREVECOEUR MO
— 314-229 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-230 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
— 314-231 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-232 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-233 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-234 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-235 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-236 1XXX7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST LOUIS MO
— 314-237 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-238 4XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J KIRKWOOD MO
— 314-239 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-241 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-242 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-244 3XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-245 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.