NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 414
ONVOY, LLC - WI 1
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
2015-08-13 414-275 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-08-13 414-509 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-06-09 414-808 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-05-22 414-206 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2015-05-21 414-928 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2015-05-14 414-629 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-03-17 414-800 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN1 WI
2015-02-16 414-622 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MILWAUKZN4 WI
2015-02-16 414-909 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MILWAUKZN1 WI
2015-02-05 414-210 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2015-01-20 414-885 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MILWAUKZN1 WI
2014-08-11 414-436 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN1 WI
2014-06-27 414-930 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MILWAUKZN1 WI
2014-03-25 414-533 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J MILWAUKZN1 WI
2014-03-17 414-439 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-12-14 414-539 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MILWAUKZN1 WI
2013-10-08 414-797 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2013-09-20 414-249 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-04-25 414-595 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2013-04-25 414-865 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN4 WI
2013-03-08 414-204 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G MILWAUKZN1 WI
2013-01-10 414-585 0–9 XXXall 10 · 3 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
2012-12-24 414-888 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN5 WI
2012-11-16 414-522 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2012-10-19 414-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN4 WI
2012-10-18 414-400 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C MILWAUKZN1 WI
2012-09-07 414-316 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2012-08-03 414-458 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN3 WI
2012-07-31 414-242 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2011-09-23 414-323 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILWAUKZN1 WI
2011-07-27 414-394 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-21 414-391 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-09 414-388 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-06-03 414-639 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-03-18 414-914 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-02-25 414-366 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-233 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-484 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-499 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-31 414-739 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2011-01-25 414-239 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2011-01-07 414-722 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 MILWAUKZN1 WI
2010-10-25 414-949 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILWAUKZN1 WI
2010-10-18 414-399 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2010-10-18 414-939 0–9 XXXall 10 · 3 holders which blocks → WISCONSIN BELL INC 9327 MILWAUKZN1 WI
2010-10-18 414-988 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MILWAUKZN1 WI
2010-08-06 414-982 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MILWAUKZN1 WI
2010-07-12 414-882 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2010-04-26 414-877 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF WISCONSIN, LLC - WI 227F MILWAUKZN1 WI
2008-12-30 414-308 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J MILWAUKZN1 WI

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.