Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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. 38

ONVOY, LLC - CA 31

NEW CINGULAR WIRELESS PCS, LLC - IL 28

NEW CINGULAR WIRELESS PCS, LLC - DC 26

ONVOY, LLC - NJ 18

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 — who really holds the numbers	Code holder	OCN	Rate center	State
—	918-284	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-285	6 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	CUSHING	OK
—	918-286	10 of 10 blocks assigned · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	BROKENARRW	OK
—	918-287	2 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	PAWHUSKA	OK
—	918-288	6 of 10 blocks assigned · 5 holders which blocks →	SOUTHWESTERN BELL	9533	SPERRY	OK
—	918-289	2 of 10 blocks assigned · 2 holders which blocks →	T-MOBILE USA, INC.	6529	TULSA	OK
—	918-291	8 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	JENKS	OK
—	918-292	2 of 10 blocks assigned · 2 holders which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-293	1 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-294	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-295	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-296	4 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	JENKS	OK
—	918-297	5 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	HARTSHORNE	OK
—	918-298	1 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	JENKS	OK
—	918-299	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	JENKS	OK
—	918-300	7 of 10 blocks assigned · 5 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	TALIHINA	OK
—	918-301	5 of 10 blocks assigned · 1 holder which blocks →	ONVOY, LLC - OK	409F	TULSA	OK
—	918-302	4 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	MCALESTER	OK
—	918-303	10 of 10 blocks assigned · 5 holders which blocks →	ONVOY, LLC - OK	409F	PAWNEE	OK
—	918-304	9 of 10 blocks assigned · 6 holders which blocks →	SOUTHWESTERN BELL	9533	OKMULGEE	OK
—	918-307	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-309	9 of 10 blocks assigned · 5 holders which blocks →	UNITED STATES CELLULAR - OK	6272	MIAMI	OK
—	918-310	9 of 10 blocks assigned · 4 holders which blocks →	UNITED STATES CELLULAR - OK	6272	MUSKOGEE	OK
—	918-311	Not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	OK
—	918-317	3 of 10 blocks assigned · 3 holders which blocks →	ONVOY, LLC - OK	409F	BROKENARRW	OK
—	918-318	9 of 10 blocks assigned · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MCALESTER	OK
—	918-319	9 of 10 blocks assigned · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HENRYETTA	OK
—	918-320	7 of 10 blocks assigned · 3 holders which blocks →	T-MOBILE USA, INC.	6529	MIAMI	OK
—	918-321	7 of 10 blocks assigned · 5 holders which blocks →	SOUTHWESTERN BELL	9533	KIEFER	OK
—	918-322	7 of 10 blocks assigned · 5 holders which blocks →	SOUTHWESTERN BELL	9533	KIEFER	OK
—	918-323	7 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	VINITA	OK
—	918-324	8 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	DEPEW	OK
—	918-326	1 of 10 blocks assigned · 1 holder which blocks →	BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC	1142	COLCORD	OK
—	918-327	4 of 10 blocks assigned · 1 holder which blocks →	T-MOBILE USA, INC.	6529	BARTLESVL	OK
—	918-328	7 of 10 blocks assigned · 4 holders which blocks →	ONVOY, LLC - OK	409F	RALSTON	OK
—	918-329	7 of 10 blocks assigned · 6 holders which blocks →	T-MOBILE USA, INC.	6529	MCALESTER	OK
—	918-330	8 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-331	0 of 10 blocks assigned · 0 holders which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-332	8 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-333	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-334	Not yet reported which blocks →	CANADIAN VALLEY TEL. CO.	1974	CROWDER	OK
—	918-335	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-336	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-337	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-338	1 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	BARTLESVL	OK
—	918-339	Not yet reported which blocks →	CANADIAN VALLEY TEL. CO.	1974	CANADIAN	OK
—	918-340	8 of 10 blocks assigned · 4 holders which blocks →	T-MOBILE USA, INC.	6529	TULSA	OK
—	918-341	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	CLAREMORE	OK
—	918-342	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	CLAREMORE	OK
—	918-343	1 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	CLAREMORE	OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.