Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 26

Rogers Communications Canada Inc. (Wireless) 23

NEW CINGULAR WIRELESS PCS, LLC - IL 22

ONVOY, LLC - CA 21

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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
—	319-254	3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	OLDS	IA
—	319-256	not yet reported which blocks →	FARMERS & MERCHANTS DBA KALON COOP TELE CO (KCTC)	1166	WAYLAND	IA
—	319-257	0XXX2XXX4XXX5XXX8XXX9XXX · 2 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	WINFIELD	IA
—	319-258	3XXX5XXX6XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	SALEM	IA
—	319-261	8XXX9XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	CEDAR RPDS	IA
—	319-265	9XXX which blocks →	PAETEC ITEL, LLC	829J	CEDAR RPDS	IA
—	319-266	not yet reported which blocks →	QWEST CORPORATION	9631	CEDARFALLS	IA
—	319-267	not yet reported which blocks →	DUMONT TEL. CO.	1152	ALLISON	IA
—	319-268	not yet reported which blocks →	QWEST CORPORATION	9631	CEDARFALLS	IA
—	319-269	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	WATERLOO	IA
—	319-270	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CEDAR RPDS	IA
—	319-272	not yet reported which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-273	not yet reported which blocks →	QWEST CORPORATION	9631	CEDARFALLS	IA
—	319-274	9XXX which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-275	not yet reported which blocks →	BUTLER-BREMER MUTUAL TEL. CO.	1115	FREDERIKA	IA
—	319-276	not yet reported which blocks →	BUTLER-BREMER MUTUAL TEL. CO.	1115	PLAINFIELD	IA
—	319-277	not yet reported which blocks →	QWEST CORPORATION	9631	CEDARFALLS	IA
—	319-278	not yet reported which blocks →	BUTLER-BREMER MUTUAL TEL. CO.	1115	CLARKSVL	IA
—	319-279	not yet reported which blocks →	READLYN TEL. CO.	1278	READLYN	IA
—	319-283	0XXX8XXX which blocks →	QWEST CORPORATION	9631	OELWEIN	IA
—	319-284	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	OELWEIN	IA
—	319-286	not yet reported which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-287	not yet reported which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-290	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	WATERLOO	IA
—	319-291	not yet reported which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-292	not yet reported which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-293	not yet reported which blocks →	VAN BUREN TEL. CO., INC.	1319	KEOSAUQUA	IA
—	319-294	not yet reported which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-295	not yet reported which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-296	5XXX6XXX7XXX8XXX · 2 holders which blocks →	QWEST CORPORATION	9631	WATERLOO	IA
—	319-297	not yet reported which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-298	not yet reported which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-310	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	CEDAR RPDS	IA
—	319-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	319-313	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	LOCAL TELEPHONE DATA SERVICES CORP.	2842	KEOKUK	IA
—	319-316	2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LOCAL TELEPHONE DATA SERVICES CORP.	2842	FT MADISON	IA
—	319-318	0–9 XXXall 10 · 7 holders which blocks →	TELNYX LLC	073H	VINTON	IA
—	319-321	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	IOWA CITY	IA
—	319-329	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CEDAR RPDS	IA
—	319-330	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	IOWA CITY	IA
—	319-331	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	IOWA CITY	IA
—	319-334	0XXX1XXX8XXX · 2 holders which blocks →	QWEST CORPORATION	9631	INDEPNDNCE	IA
—	319-335	not yet reported which blocks →	QWEST CORPORATION	9631	IOWA CITY	IA
—	319-337	not yet reported which blocks →	QWEST CORPORATION	9631	IOWA CITY	IA
—	319-338	not yet reported which blocks →	QWEST CORPORATION	9631	IOWA CITY	IA
—	319-339	not yet reported which blocks →	QWEST CORPORATION	9631	IOWA CITY	IA
—	319-341	not yet reported which blocks →	QWEST CORPORATION	9631	IOWA CITY	IA
—	319-342	not yet reported which blocks →	LA PORTE CITY TEL. CO.	1220	LAPORTE CY	IA
—	319-345	0XXX5XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	REINBECK	IA
—	319-346	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9631	PARKERSBG	IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.