NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
2005-07-13 504-377 0–9 XXXall 10 · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2005-07-13 515-985 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IA 221F DES MOINES IA
2005-07-13 517-876 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-07-13 562-219 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K NORWALK CA
2005-07-13 574-622 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BRISTOL IN
2005-07-13 626-872 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ALHAMBRA CA
2005-07-13 870-880 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCCRORY AR
2005-07-13 947-212 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-344 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-456 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-550 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-616 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-770 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-844 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-13 947-987 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2005-07-12 320-444 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 WILLMAR MN
2005-07-12 530-797 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GRIDLEY CA
2005-07-12 575-736 not yet reported which blocks → PVT NETWORKS, INC. - NM 438D ARTESIA NM
2005-07-12 807-230 not yet reported which blocks → ExaTEL Inc. 3147 Marathon —
2005-07-12 807-270 not yet reported which blocks → ExaTEL Inc. 3147 Fort Frances —
2005-07-12 807-590 not yet reported which blocks → ExaTEL Inc. 3147 Atikokan —
2005-07-12 807-880 not yet reported which blocks → ExaTEL Inc. 3147 Nipigon —
2005-07-12 850-590 0–9 XXXwhole prefix which blocks → POWERTEL JACKSONVILLE LICENSES, INC. 7472 TALLAHASSE FL
2005-07-12 905-769 not yet reported which blocks → Primus Telecommunications Canada Inc. 201A Hamilton —
2005-07-11 204-289 not yet reported which blocks → Primus Telecommunications Canada Inc. 201A Winnipeg —
2005-07-11 306-290 not yet reported which blocks → SaskTel Mobility 9868 Saskatoon —
2005-07-11 330-546 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CANTON OH
2005-07-11 423-548 not yet reported which blocks → ETC COMMUNICATIONS, L.L.C. - TN 566D COPPERBSIN TN
2005-07-11 845-837 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MONROE NY
2005-07-09 412-735 0–9 XXXall 10 · 2 holders which blocks → CITYNET PENNSYLVANIA, LLC - PA 657B PTTSBGZON1 PA
2005-07-09 630-386 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 W CHICAGO IL
2005-07-09 724-833 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 WAYNESBURG PA
2005-07-07 218-595 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MN 184D TWOHARBORS MN
2005-07-07 702-508 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NV 4805 MTCHARLETN NV
2005-07-07 775-909 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NV 4805 SILVER SPG NV
2005-07-07 828-554 0–9 XXXall 10 · 7 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 0509 CHEROKEE NC
2005-07-06 248-793 0–9 XXXall 10 · 6 holders which blocks → 123.NET, LLC 2550 ORTONVILLE MI
2005-07-06 443-954 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J BALTIMORE MD
2005-07-06 601-889 7XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 PICAYUNE MS
2005-07-06 662-858 3XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MS 6396 WINONA MS
2005-07-06 702-688 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAS VEGAS NV
2005-07-06 865-896 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TN 4806 SOLWAY TN
2005-07-05 501-530 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 BALD KNOB AR
2005-07-01 315-503 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 MINOA NY
2005-07-01 330-301 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 YOUNGSTOWN OH
2005-07-01 406-440 2XXX5XXX6XXX7XXX · 3 holders which blocks → 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 3924 HELENA MT
2005-07-01 423-465 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NEWPORT TN
2005-07-01 484-264 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ALLENTOWN PA
2005-07-01 567-303 0–9 XXXall 10 · 5 holders which blocks → TIER 2 COMMUNICATIONS, LLC 8168 MANSFIELD OH
2005-07-01 615-713 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MURFREESBO TN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.