Recent prefix assignments

1 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 — NPA 423

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 1

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
2023-03-02	423-831	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	732J	GREENEVL	TN
2023-01-25	423-550	0XXX1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TN	124F	MIDWAY	TN
2022-12-01	423-816	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	BRISTOL	TN
2022-11-09	423-527	0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks →	COMMIO, LLC	939H	SODDYDAISY	TN
2022-11-08	423-513	0XXX2XXX3XXX6XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TN	114F	VONORE	TN
2022-11-04	423-395	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	POWERTEL NASHVILLE LICENSES, INC.	7476	ATHENS	TN
2022-10-10	423-998	6XXX7XXX8XXX9XXX which blocks →	COMMIO, LLC	939H	JELLICO	TN
2022-07-01	423-350	0–9 XXXall 10 · 2 holders which blocks →	COMMIO, LLC	939H	BRISTOL	TN
2022-07-01	423-860	0–9 XXXall 10 · 2 holders which blocks →	COMMIO, LLC	939H	CHATTNOOGA	TN
2022-06-30	423-275	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	CHATTNOOGA	TN
2022-04-21	423-222	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	PIKEVILLE	TN
2022-03-23	423-925	0–9 XXXall 10 · 6 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	LAFOLLETTE	TN
2022-03-01	423-927	0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	MORRISTOWN	TN
2022-02-03	423-203	0–9 XXXall 10 · 4 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	CHATTNOOGA	TN
2022-02-03	423-804	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TN	124F	BRISTOL	TN
2022-02-01	423-796	0–9 XXXall 10 · 2 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	JOHNSON CY	TN
2022-01-21	423-853	0–9 XXXall 10 · 3 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	JOHNSON CY	TN
2022-01-20	423-932	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	ETOWAH	TN
2022-01-13	423-832	4XXX which blocks →	TON80 COMMUNICATIONS, LLC	516J	CLINCHPORT	TN
2021-12-30	423-776	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	PIKEVILLE	TN
2021-12-29	423-749	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	COLLEGEDL	TN
2021-12-15	423-740	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN	6673	CLEVELAND	TN
2021-12-15	423-769	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TN	124F	BENTON	TN
2021-12-14	423-738	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	BRISTOL	TN
2021-12-02	423-705	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	478J	JOHNSON CY	TN
2021-12-02	423-719	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	478J	CHATTNOOGA	TN
2021-09-16	423-696	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	POWERTEL NASHVILLE LICENSES, INC.	7476	ROGERSVL	TN
2021-09-08	423-694	0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	POWERTEL NASHVILLE LICENSES, INC.	7476	SWEETWATER	TN
2021-09-03	423-750	0–9 XXXall 10 · 2 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	CHATTNOOGA	TN
2021-09-03	423-848	0–9 XXXall 10 · 2 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	JOHNSON CY	TN
2021-09-01	423-691	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TN	525E	ATHENS	TN
2021-09-01	423-692	0XXX1XXX · 2 holders which blocks →	SKYBEST COMMUNICATIONS, INC. - TN	081J	BUTLER	TN
2021-09-01	423-759	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TN	525E	MORRISTOWN	TN
2021-07-01	423-689	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TN	124F	BRISTOL	TN
2021-05-17	423-688	0XXX8XXX9XXX · 3 holders which blocks →	TELNYX LLC	073H	SNEEDVILLE	TN
2021-05-13	423-687	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	PIKEVILLE	TN
2021-04-15	423-678	0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - TN	525E	ROAN MT	TN
2021-04-15	423-686	2XXX3XXX5XXX6XXX7XXX8XXX which blocks →	ONVOY, LLC - TN	525E	FORK RIDGE	TN
2021-04-13	423-673	0–9 XXXall 10 · 3 holders which blocks →	PAETEC ITEL, LLC	829J	JOHNSON CY	TN
2021-04-13	423-674	1XXX2XXX3XXX4XXX5XXX8XXX · 2 holders which blocks →	ONVOY, LLC - TN	525E	DAYTON	TN
2021-04-13	423-675	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - TN	525E	JASPER	TN
2021-04-13	423-679	1XXX3XXX4XXX5XXX9XXX · 4 holders which blocks →	ONVOY, LLC - TN	525E	OOLTEWAH	TN
2021-04-13	423-904	0–9 XXXall 10 · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	CHATTNOOGA	TN
2021-04-13	423-905	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	JOHNSON CY	TN
2021-03-31	423-880	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TN	525E	JOHNSON CY	TN
2021-03-31	423-980	0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks →	ONVOY, LLC - TN	525E	CHATTNOOGA	TN
2021-03-18	423-934	0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	SURGOINSVL	TN
2021-01-20	423-766	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TN	525E	LIMESTONE	TN
2020-09-29	423-671	0–9 XXXall 10 · 4 holders which blocks →	IP HORIZON LLC	515J	CHATTNOOGA	TN
2020-09-23	423-670	0–9 XXXall 10 · 4 holders which blocks →	IP HORIZON LLC	515J	JOHNSON CY	TN

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.