NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
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
2012-01-18 203-343 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2012-01-18 210-202 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2012-01-18 214-846 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2012-01-18 276-293 0–9 XXXall 10 · 7 holders which blocks → MGW NETWORKS, L.L.C. - VA 609F GALAX VA
2012-01-18 408-601 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNJS NORTH CA
2012-01-18 408-604 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SUNNYVALE CA
2012-01-18 563-313 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CRESCO IA
2012-01-18 575-567 0–9 XXXall 10 · 6 holders which blocks → INTERACTIVE NETWORKS CORPORATION -NM 167F DEMING NM
2012-01-18 615-903 0–9 XXXall 10 · 5 holders which blocks → TENNESSEE TEL. CO. 0575 LAVERGNE TN
2012-01-18 708-541 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLUEISLAND IL
2012-01-18 713-998 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
2012-01-18 832-574 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
2012-01-18 832-581 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2012-01-18 848-213 0–9 XXXall 10 · 4 holders which blocks → BLOCK LINE SYSTEMS, LLC - NJ 835E MONMTH JCT NJ
2012-01-17 226-885 not yet reported which blocks → Fido Solutions Inc. 5643 Listowel —
2012-01-17 289-829 not yet reported which blocks → Fido Solutions Inc. 8820 Cobourg —
2012-01-17 331-202 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELMHURST IL
2012-01-17 331-209 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELMHURST IL
2012-01-17 613-772 not yet reported which blocks → Fido Solutions Inc. 5643 Perth —
2012-01-17 705-539 not yet reported which blocks → Fido Solutions Inc. 5643 Collingwood —
2012-01-17 778-632 not yet reported which blocks → Fido Solutions Inc. 5643 Grand Forks —
2012-01-17 778-633 not yet reported which blocks → Fido Solutions Inc. 5643 Castlegar —
2012-01-17 778-637 not yet reported which blocks → Fido Solutions Inc. 5643 Vanderhoof —
2012-01-17 778-638 not yet reported which blocks → Fido Solutions Inc. 5643 Quesnel —
2012-01-17 778-639 not yet reported which blocks → Fido Solutions Inc. 5643 Merritt —
2012-01-17 813-867 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G TAMPACEN FL
2012-01-13 202-805 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DC 6402 WSHNGTNZN1 DC
2012-01-13 312-888 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-01-13 330-616 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C NO CANTON OH
2012-01-13 404-548 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA GA
2012-01-13 404-623 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA GA
2012-01-13 407-607 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 WINTERPARK FL
2012-01-13 470-242 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA NE GA
2012-01-13 708-518 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OAK FOR SO IL
2012-01-13 786-440 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C NORTH DADE FL
2012-01-13 786-660 0–9 XXXall 10 · 2 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G MIAMI FL
2012-01-13 904-802 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C JACKSONVL FL
2012-01-13 904-888 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G JACKSONVL FL
2012-01-13 954-314 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C FTLAUDERDL FL
2012-01-12 205-234 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 BIRMINGHAM AL
2012-01-12 256-202 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 GUNTERSVL AL
2012-01-12 256-224 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 ARAB AL
2012-01-12 334-540 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 PHENIXCITY AL
2012-01-12 575-352 not yet reported which blocks → PLATEAU TELECOMMUNICATIONS, INC. - NM 777B SPRINGER NM
2012-01-12 760-919 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J IMPERIAL CA
2012-01-12 805-366 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OXNARD CA
2012-01-12 918-817 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 SALLISAW OK
2012-01-11 581-646 not yet reported which blocks → Videotron Ltd. 8306 St-Jean-de-Dieu —
2012-01-11 775-644 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C BAKER NV
2012-01-11 872-202 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.