NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 618
FRONTIER NORTH, INC. - IL 126
ILLINOIS BELL TEL CO 111
NEW CINGULAR WIRELESS PCS, LLC - IL 95
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 62
LEVEL 3 COMMUNICATIONS, LLC - IL 46
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-03-01 618-872 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GLENCARBON IL
2022-02-01 618-818 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALTON IL
2022-02-01 618-819 0XXX1XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BATCHTOWN IL
2022-02-01 618-820 0XXX1XXX8XXX which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BUNKERHILL IL
2021-12-30 618-814 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 EWING IL
2021-12-30 618-815 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J E ST LOUIS IL
2021-12-30 618-817 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 BELLEVILLE IL
2021-11-30 618-810 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2021-11-30 618-813 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2021-10-29 618-807 0XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H ALHAMBRA IL
2021-10-29 618-809 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON IL
2021-10-29 618-866 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H BELLEVILLE IL
2021-10-29 618-955 5XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H ADDIEVILLE IL
2021-09-29 618-805 1XXX5XXX8XXX · 3 holders which blocks → IP HORIZON LLC 515J CAIRO IL
2021-08-31 618-761 0XXX1XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K HOFFMAN IL
2021-08-31 618-766 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K IRVINGTON IL
2021-08-31 618-769 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BARTELSO IL
2021-08-31 618-794 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANITE CY IL
2021-08-31 618-796 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALTON IL
2021-07-29 618-760 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2021-06-29 618-738 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E ALTAMONT IL
2021-06-18 618-750 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLLINSVL IL
2021-06-02 618-705 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E ALBERS IL
2021-06-02 618-720 0XXX1XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E POCAHONTAS IL
2021-06-02 618-721 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → TELNYX LLC 073H BROWNSTOWN IL
2021-06-02 618-725 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 VANDALIA IL
2021-06-02 618-737 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
2021-05-04 618-682 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2021-04-02 618-680 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 O FALLON IL
2021-04-02 618-685 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 EDWARDSVL IL
2021-04-02 618-902 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H OLNEY IL
2021-02-05 618-642 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCC NETWORK SERVICES, LLC 075A GREENVILLE IL
2020-09-04 618-636 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 478J ALTON IL
2020-08-04 618-621 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D CAIRO IL
2020-08-04 618-630 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J CARBONDALE IL
2020-08-04 618-631 0–9 XXXall 10 · 3 holders which blocks → STRATUS NETWORKS 495J COLLINSVL IL
2020-08-04 618-788 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ANNA IL
2020-07-06 618-591 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC 224C ELDORADO IL
2020-07-06 618-598 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C OKAWVILLE IL
2020-07-06 618-851 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H ANNA IL
2020-06-05 618-575 0XXX1XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SEFTON IL
2020-06-05 618-590 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E DIX IL
2020-06-05 618-595 0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SHIPMAN IL
2020-06-05 618-608 0XXX1XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E NEW MINDEN IL
2020-06-05 618-620 0XXX1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC 224C HAMBURG IL
2020-05-05 618-415 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BEECHER CY IL
2020-05-05 618-502 0XXX1XXX2XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E FIELDON IL
2020-05-05 618-506 0XXX1XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E HETTICK IL
2020-05-05 618-552 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SANDOVAL IL
2020-04-08 618-373 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANITE CY IL

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.