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 417
SOUTHWESTERN BELL 100
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 88
BRIGHTSPEED OF MISSOURI, LLC 82
NEW CINGULAR WIRELESS PCS, LLC - IL 51
ONVOY, LLC - MO 40
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
2018-03-15 417-912 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BOLIVAR MO
2018-03-09 417-803 1XXX which blocks → MCC TELEPHONY LLC 593K MILLER MO
2018-02-21 417-409 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MO 093F SPRINGFLD MO
2018-02-09 417-415 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2017-11-01 417-403 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2017-09-07 417-430 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2017-07-03 417-346 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E NEOSHO MO
2017-06-01 417-519 0XXX4XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 VERONA MO
2017-05-11 417-402 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2017-04-25 417-404 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MO 093F PIERCECITY MO
2017-04-25 417-609 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MO 093F WEBB CITY MO
2017-04-14 417-815 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MO 093F SPRINGFLD MO
2017-04-04 417-705 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2017-01-10 417-802 2XXX4XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 STOTTSCITY MO
2016-11-09 417-340 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2016-11-04 417-370 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SPRINGFLD MO
2016-10-31 417-371 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J SPRINGFLD MO
2016-09-19 417-421 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2016-08-03 417-306 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2016-07-11 417-615 9XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 LIBERAL MO
2016-06-22 417-709 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2016-04-14 417-509 0–9 XXXall 10 · 3 holders which blocks → UNITED STATES CELLULAR - MO 6275 SPRINGFLD MO
2016-03-15 417-210 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2016-02-18 417-920 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2015-12-22 417-292 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BOLIVAR MO
2015-12-22 417-324 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2015-12-18 417-307 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BOLIVAR MO
2015-09-08 417-493 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2015-06-17 417-697 0XXX4XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 PURDY MO
2015-05-01 417-368 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MCC TELEPHONY LLC 593K SPRINGFLD MO
2015-04-20 417-986 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E SPRINGFLD MO
2015-02-11 417-813 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2014-10-20 417-633 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2014-09-11 417-351 0–9 XXXall 10 · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SPRINGFLD MO
2014-03-26 417-755 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - MO 6275 SPRINGFLD MO
2014-02-28 417-319 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SPRINGFLD MO
2014-02-06 417-308 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K AURORA MO
2014-01-24 417-757 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BRANSON MO
2013-12-17 417-318 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 HOUSTON MO
2013-11-11 417-556 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7594 JOPLIN MO
2013-11-04 417-320 0–9 XXXall 10 · 2 holders which blocks → CSC VOICE, LLC 612K BRANSON MO
2013-11-04 417-494 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K NIXA MO
2013-03-21 417-450 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G SPRINGFLD MO
2012-07-24 417-771 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2012-07-03 417-720 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K SPRINGFLD MO
2011-11-28 417-422 0–9 XXXall 10 · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 BOLIVAR MO
2011-11-28 417-909 2XXX4XXX9XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 MYRTLE MO
2011-09-27 417-614 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → AT&T ENTERPRISES, LLC 516C CARL JCT MO
2011-04-21 417-315 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SPRINGFLD MO
2011-03-22 417-352 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C WALNUT GRV 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.