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 217
ILLINOIS BELL TEL CO 129
FRONTIER NORTH, INC. - IL 114
NEW CINGULAR WIRELESS PCS, LLC - IL 72
LEVEL 3 COMMUNICATIONS, LLC - IL 59
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 51
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
2024-12-13 217-951 0–9 XXXall 10 · 3 holders which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 MATTOON IL
2024-10-22 217-943 1XXX which blocks → NUSO, LLC 732J TAYLORVL IL
2024-10-17 217-758 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON IL
2024-07-23 217-389 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON IL
2023-10-31 217-217 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C LINCOLN IL
2023-07-13 217-266 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANVILLE IL
2023-04-11 217-988 1XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ARCOLA IL
2022-09-29 217-261 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E MATTOON IL
2021-03-26 217-990 0XXX2XXX3XXX4XXX which blocks → ONVOY, LLC 224C ARCOLA IL
2021-02-08 217-973 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → CSC WIRELESS, LLC 425J CHAMPAURBN IL
2021-01-15 217-986 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC WIRELESS, LLC 425J SPRINGFLD IL
2020-12-14 217-969 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LITCHFIELD IL
2020-11-13 217-981 0XXX1XXX2XXX6XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 VIRDEN IL
2020-10-14 217-939 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WINCHESTER IL
2020-08-14 217-961 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C MATTOON IL
2020-05-15 217-860 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHATHAM IL
2020-02-19 217-798 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MATTOON IL
2020-01-29 217-815 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → ONVOY, LLC 224C NIOTA IL
2020-01-27 217-858 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 THOMASBORO IL
2020-01-24 217-618 0XXX1XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC 224C ARENZVILLE IL
2019-12-19 217-977 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DANVILLE IL
2019-09-24 217-900 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H SPRINGFLD IL
2019-09-09 217-760 0XXX1XXX2XXX · 2 holders which blocks → VONAGE AMERICA LLC 197D CARROLLTON IL
2019-09-09 217-907 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ST JOSEPH IL
2019-09-09 217-912 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E RIDGE FARM IL
2019-05-29 217-708 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WABASH INDEPENDENT NETWORKS, INC DBA WABASH COMM 772H EFFINGHAM IL
2019-05-17 217-859 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DECATUR IL
2019-03-26 217-290 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C RIVERTON IL
2018-12-17 217-920 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DANVILLE IL
2018-10-18 217-926 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARCOLA IL
2018-09-10 217-699 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C BEMENT IL
2018-06-11 217-606 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D SPRINGFLD IL
2018-01-08 217-500 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 EFFINGHAM IL
2017-10-10 217-790 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHARLESTON IL
2017-09-06 217-312 0XXX2XXX4XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 OWANECO IL
2017-09-06 217-315 0XXX1XXX2XXX4XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WITT IL
2017-08-21 217-729 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHAMPAURBN IL
2017-04-28 217-800 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H CHAMPAURBN IL
2017-02-16 217-902 0–9 XXXall 10 · 3 holders which blocks → ILLINOIS BELL TEL CO 9329 CHAMPAURBN IL
2017-02-09 217-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C CHAMPAURBN IL
2017-02-01 217-319 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHATHAM IL
2016-10-27 217-616 0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 AUBURN IL
2016-10-27 217-780 0XXX1XXX7XXX9XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 CASEY IL
2016-05-05 217-695 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 QUINCY IL
2016-02-23 217-200 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CHAMPAURBN IL
2016-02-23 217-716 0XXX1XXX2XXX6XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CARLINVL IL
2015-10-13 217-559 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E WESTVILLE IL
2015-10-09 217-992 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E MOWEAQUA IL
2015-10-09 217-995 0XXX1XXX2XXX3XXX5XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 LOVINGTON IL
2015-10-09 217-996 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E OAKWOOD 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.