NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

3 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, last 30 days — NPA 227
NEW CINGULAR WIRELESS PCS, LLC - DC 2
ONVOY, LLC - MD 1
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
2024-03-08 227-234 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D LEONARDTN MD
2024-02-08 227-233 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
2024-02-02 227-232 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D LAUREL236 MD
2024-01-29 227-226 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D FREDERICK MD
2024-01-29 227-227 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D GAITHERSBG MD
2024-01-29 227-228 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN2 MD
2024-01-29 227-229 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN4 MD
2024-01-29 227-230 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN5 MD
2024-01-29 227-231 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN6 MD
2023-12-27 227-225 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2023-12-22 227-224 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
2023-11-21 227-221 0XXX1XXX2XXX3XXX4XXX which blocks → COMMIO, LLC 939H SMITHSBURG MD
2023-11-21 227-223 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H FREDERICK MD
2023-11-03 227-220 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALDORF MD
2023-10-25 227-219 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ASHTON236 MD
2023-10-19 227-218 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNG236Z14 MD
2023-10-17 227-222 0–9 XXXall 10 · 6 holders which blocks → WIDE VOICE, LLC - MD 530H WSNGTNZN16 MD
2023-10-12 227-217 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2023-10-11 227-999 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - MD 530H WSNGTNZN10 MD
2023-09-20 227-215 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2023-09-20 227-216 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN10 MD
2023-09-18 227-888 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WIDE VOICE, LLC - MD 530H WSNG238Z15 MD
2023-09-11 227-214 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2023-09-06 227-213 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2023-09-01 227-207 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → COMMIO, LLC 939H BITTINGER MD
2023-09-01 227-208 0XXX1XXX2XXX3XXX4XXX which blocks → COMMIO, LLC 939H FLINTSTONE MD
2023-09-01 227-209 0XXX1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → COMMIO, LLC 939H GRANTSVL MD
2023-09-01 227-210 0XXX1XXX2XXX3XXX4XXX which blocks → COMMIO, LLC 939H MCCOOLE MD
2023-09-01 227-212 0XXX1XXX2XXX3XXX4XXX which blocks → COMMIO, LLC 939H WESTERNPT MD
2023-08-31 227-204 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2023-08-31 227-205 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2023-08-31 227-206 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
2023-08-17 227-368 0XXX1XXX6XXX8XXX · 2 holders which blocks → WIDE VOICE, LLC - MD 530H MECHANCSVL MD
2023-08-15 227-203 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 FREDERICK MD
2023-08-04 227-200 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 MD
2023-08-04 227-201 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2023-08-04 227-202 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN10 MD
2023-07-27 227-777 1XXX2XXX3XXX4XXX7XXX · 4 holders which blocks → WIDE VOICE, LLC - MD 530H ASHTON238 MD
— 227-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MD
— 227-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-700 not yet reported which blocks → MD
— 227-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 227-950 not yet reported which blocks → MD
— 227-958 not yet reported which blocks → MD

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.