NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 19
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
2005-10-14 862-371 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWARK NJ
2005-10-13 213-394 0–9 XXXall 10 · 3 holders which blocks → DMR COMMUNICATIONS INC. - CA 478A LSAN DA 01 CA
2005-10-13 270-933 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → DIALOG TELECOMMUNICATIONS, INC. - KY 292D PADUCAH KY
2005-10-13 479-256 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 ROGERS AR
2005-10-13 479-282 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 ROGERS AR
2005-10-13 479-316 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 FAYETTEVL AR
2005-10-13 479-802 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BENTONVL AR
2005-10-13 702-423 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NV 6458 LAS VEGAS NV
2005-10-13 801-658 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PAYSON UT
2005-10-13 909-694 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 UPLAND CA
2005-10-12 289-288 not yet reported which blocks → Zayo Canada Inc. 8304 Burlington —
2005-10-12 289-291 not yet reported which blocks → Zayo Canada Inc. 8304 Oakville —
2005-10-12 289-292 not yet reported which blocks → Zayo Canada Inc. 8304 Niagara Falls —
2005-10-12 503-764 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
2005-10-12 580-599 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENID OK
2005-10-12 705-251 not yet reported which blocks → ExaTEL Inc. 3147 Sault Ste. Marie —
2005-10-12 705-847 not yet reported which blocks → ExaTEL Inc. 3147 Elliot Lake —
2005-10-11 208-708 not yet reported which blocks → UNION TELEPHONE COMPANY 013B POCATELLO ID
2005-10-11 323-482 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2005-10-11 347-529 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K NWYRCYZN06 NY
2005-10-11 520-351 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2005-10-11 619-964 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
2005-10-11 801-704 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPRINGVL UT
2005-10-11 805-861 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VNTRA CNTL CA
2005-10-11 813-516 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 TAMPA FL
2005-10-11 909-273 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARROWHEAD CA
2005-10-11 909-693 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 S BERNDINO CA
2005-10-11 916-770 0–9 XXXall 10 · 5 holders which blocks → CONSOLIDATED COMMUNICATIONS OF CALIFORNIA COMPANY 2334 RSVL MAIN CA
2005-10-11 920-818 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K STURGEONBY WI
2005-10-11 951-796 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2005-10-10 304-909 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J WHELNGZON3 WV
2005-10-10 773-621 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-10-08 347-607 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN05 NY
2005-10-07 320-443 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CLOUD MN
2005-10-07 336-620 not yet reported which blocks → CAROLINA WEST WIRELESS, INC. 5932 BALDWIN NC
2005-10-07 580-565 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KINGSTON OK
2005-10-07 702-756 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2005-10-07 864-841 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 WILLIAMSTN SC
2005-10-06 317-483 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C MOORESVL IN
2005-10-06 325-726 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLEMAN TX
2005-10-06 413-331 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CHICOPEE MA
2005-10-06 630-401 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AURORA IL
2005-10-06 815-581 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING GRV IL
2005-10-06 815-582 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2005-10-05 204-205 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Beausejour —
2005-10-05 225-650 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C BATONROUGE LA
2005-10-05 250-805 not yet reported which blocks → TELUS 8086 Revelstoke —
2005-10-05 250-872 not yet reported which blocks → TELUS 8086 Okanagan Mission —
2005-10-05 253-304 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2005-10-05 306-390 not yet reported which blocks → SaskTel Mobility 9868 Cut Knife —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.