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
—	918-227	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	SAPULPA	OK
—	918-228	9 of 10 blocks assigned · 3 holders which blocks →	ONVOY, LLC - OK	409F	ALLUWE	OK
—	918-229	8 of 10 blocks assigned · 3 holders which blocks →	PAETEC ITEL, LLC	829J	SPERRY	OK
—	918-230	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-231	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-232	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-233	9 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	SO CHETOPA	OK
—	918-234	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-235	9 of 10 blocks assigned · 6 holders which blocks →	SOUTHWESTERN BELL	9533	SALLISAW	OK
—	918-237	9 of 10 blocks assigned · 2 holders which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-238	10 of 10 blocks assigned · 4 holders which blocks →	TELNYX LLC	073H	MIAMI	OK
—	918-241	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	SAND SPG	OK
—	918-242	0 of 10 blocks assigned · 0 holders which blocks →	CIMARRON TEL. CO.	1982	PRUE	OK
—	918-243	Not yet reported which blocks →	CIMARRON TEL. CO.	1982	KEYSTONE	OK
—	918-244	0 of 10 blocks assigned · 0 holders which blocks →	UNITED STATES CELLULAR - OK	6272	VINITA	OK
—	918-245	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	SAND SPG	OK
—	918-246	4 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	SAND SPG	OK
—	918-247	2 of 10 blocks assigned · 2 holders which blocks →	OKLAHOMA COMMUNICATION SYSTEM, INC.	1984	KELLYVILLE	OK
—	918-248	8 of 10 blocks assigned · 6 holders which blocks →	SOUTHWESTERN BELL	9533	SAPULPA	OK
—	918-249	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-250	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-251	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-252	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-253	0 of 10 blocks assigned · 0 holders which blocks →	GRAND TEL. CO., INC.	1994	JAY	OK
—	918-254	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-255	7 of 10 blocks assigned · 4 holders which blocks →	SOUTHWESTERN BELL	9533	SOCOFFEYVL	OK
—	918-256	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	VINITA	OK
—	918-257	5 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	AFTON	OK
—	918-258	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-259	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	BROKENARRW	OK
—	918-260	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-261	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TULSA	OK
—	918-262	9 of 10 blocks assigned · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	WATTS	OK
—	918-263	Not yet reported which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	AVANT	OK
—	918-266	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	CATOOSA	OK
—	918-267	Not yet reported which blocks →	BEGGS TEL. CO., INC.	1968	BEGGS	OK
—	918-268	8 of 10 blocks assigned · 5 holders which blocks →	UNITED STATES CELLULAR - OK	6272	HENRYETTA	OK
—	918-269	1 of 10 blocks assigned · 1 holder which blocks →	T-MOBILE USA, INC.	6529	TULSA	OK
—	918-270	2 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-271	5 of 10 blocks assigned · 3 holders which blocks →	T-MOBILE USA, INC.	6529	TULSA	OK
—	918-272	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	OWASSO	OK
—	918-273	1 of 10 blocks assigned · 1 holder which blocks →	SOUTHWESTERN BELL	9533	NOWATA	OK
—	918-274	Not yet reported which blocks →	SOUTHWESTERN BELL	9533	OWASSO	OK
—	918-275	Not yet reported which blocks →	TOTAH COMMUNICATIONS, INC.	2030	TALALA	OK
—	918-276	8 of 10 blocks assigned · 4 holders which blocks →	UNITED STATES CELLULAR - OK	6272	VINITA	OK
—	918-278	Not yet reported which blocks →	PAGING TULSA, INC.	6840	TULSA	OK
—	918-279	4 of 10 blocks assigned · 3 holders which blocks →	VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW	1165	COWETA	OK
—	918-280	4 of 10 blocks assigned · 3 holders which blocks →	SOUTHWESTERN BELL	9533	TULSA	OK
—	918-281	4 of 10 blocks assigned · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA OK - LLC	530C	TULSA	OK
—	918-283	7 of 10 blocks assigned · 7 holders 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.