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
2016-03-31 314-396 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
2016-02-24 314-356 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
2016-02-10 314-701 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MO 093F MEHLVILLE MO
2016-01-20 314-376 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST LOUIS MO
2015-11-23 314-207 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
2015-11-23 314-310 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F LADUE MO
2015-06-09 314-386 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2015-04-23 314-930 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2015-04-14 314-366 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST LOUIS MO
2015-03-17 314-900 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F LADUE MO
2015-03-02 314-250 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2015-02-26 314-379 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2015-02-17 314-500 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
2015-02-17 314-797 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
2015-02-16 314-939 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEHLVILLE MO
2015-02-10 314-474 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E ST LOUIS MO
2014-12-22 314-328 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ST LOUIS MO
2014-11-07 314-793 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2014-10-17 314-349 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2014-09-23 314-688 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 ST LOUIS MO
2014-09-18 314-312 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E ST LOUIS MO
2014-07-11 314-325 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C LADUE MO
2014-07-03 314-339 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 ST LOUIS MO
2014-05-30 314-240 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2014-05-01 314-254 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E LADUE MO
2014-03-07 314-309 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2014-03-03 314-896 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2014-02-28 314-764 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2014-01-14 314-224 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C ST LOUIS MO
2013-12-04 314-833 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
2013-11-08 314-745 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-10-22 314-755 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2013-10-08 314-858 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K KIRKWOOD MO
2013-09-19 314-201 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2013-09-19 314-728 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-08-08 314-326 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-06-14 314-665 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-05-24 314-297 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E ST LOUIS MO
2013-05-23 314-319 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-05-20 314-202 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
2013-04-19 314-203 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-04-19 314-585 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LADUE MO
2013-04-04 314-736 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LADUE MO
2013-03-21 314-384 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G CREVECOEUR MO
2013-03-07 314-696 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MISSOURI, LLC - MO 225F ST LOUIS MO
2013-02-21 314-449 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ST LOUIS MO
2013-02-19 314-305 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
2013-01-15 314-278 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
2013-01-15 314-526 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KIRKWOOD MO
2012-11-02 314-478 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD 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.