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 641
WINDSTREAM IOWA COMMUNICATIONS, INC. 60
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 46
UNITED STATES CELLULAR - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 32
QWEST CORPORATION 30
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
2020-08-10 641-214 0XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVIS CITY IA
2020-08-05 641-277 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OTTUMWA IA
2020-07-21 641-688 2XXX5XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H TINGLEY IA
2020-07-21 641-955 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H MONROE IA
2020-07-21 641-977 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H NEW SHARON IA
2020-01-09 641-222 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H BRITT IA
2019-12-30 641-900 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H MONA IA
2019-12-27 641-300 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H OSAGE IA
2019-12-27 641-356 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H GLADBROOK IA
2019-12-27 641-500 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D IOWA FALLS IA
2019-12-27 641-600 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H LIBERTYVL IA
2019-12-27 641-677 0XXX3XXX4XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H SHEFFIELD IA
2019-11-05 641-276 1XXX2XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H AGENCY IA
2019-11-05 641-400 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - IA 221F HUMESTON IA
2019-11-05 641-448 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - IA 221F MELCHER IA
2019-10-21 641-327 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 WELLSBURG IA
2019-09-12 641-441 1XXX2XXX4XXX · 2 holders which blocks → GREENWAY COMMUNICATIONS L.L.C. - IA 860F KLEMME IA
2019-08-29 641-334 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IA 221F ROSE HILL IA
2019-08-29 641-461 0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → HD CARRIER LLC 321J CHARLES CY IA
2019-02-12 641-362 0–9 XXXall 10 · 8 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F CRESTON IA
2018-11-07 641-609 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - IA 221F ALEXANDER IA
2018-10-25 641-401 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - IA 221F SWALEDALE IA
2018-10-25 641-406 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - IA 221F MESERVEY IA
2018-10-25 641-614 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - IA 221F SHARPSBURG IA
2018-10-25 641-646 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - IA 221F ROWAN IA
2018-10-25 641-671 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IA 221F LENOX IA
2018-10-25 641-681 2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - IA 221F GOODELL IA
2018-07-30 641-384 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 BELMOND IA
2018-07-06 641-501 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM MONTEZUMA, LLC 1248 MONTEZUMA IA
2018-06-29 641-200 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E CHARLES CY IA
2018-06-21 641-575 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E OTTUMWA IA
2018-06-20 641-354 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → METROPCS, INC. 5562 MARSHALLTN IA
2018-06-20 641-630 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 HAMPTON IA
2018-05-02 641-387 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TOLEDO IA
2018-03-06 641-548 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2018-03-06 641-808 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLO IA
2018-02-16 641-800 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - IA 221F ACKLEY IA
2018-02-16 641-999 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - IA 221F NASHUA IA
2017-12-12 641-321 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MOUNT AYR IA
2017-12-06 641-631 0–9 XXXall 10 · 4 holders which blocks → OMNITEL COMMUNICATIONS, INC. - IA 3620 CHARLES CY IA
2017-12-06 641-666 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → ONVOY, LLC - IA 221F OSAGE IA
2017-08-17 641-206 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSCEOLA IA
2017-07-20 641-505 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E MANLY IA
2017-04-19 641-531 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IA 8344 IOWA FALLS IA
2016-08-31 641-307 0XXX3XXX6XXX7XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GUTHRIECTR IA
2016-07-28 641-432 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 FORESTCITY IA
2016-06-02 641-244 0–9 XXXall 10 · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OTTUMWA IA
2015-06-25 641-212 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GREENFIELD IA
2015-06-25 641-557 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWHAMPTON IA
2015-06-25 641-599 4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ST ANSGAR IA

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.