NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 860-887 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NORWICH | CT |
| — | 860-889 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NORWICH | CT |
| — | 860-892 | 8XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NORWICH | CT |
| — | 860-895 | 0XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-896 | 5XXX7XXX8XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | ROCKVILLE | CT |
| — | 860-923 | 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | PUTNAM | CT |
| — | 860-927 | 8XXX9XXX · 2 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | KENT | CT |
| — | 860-928 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | PUTNAM | CT |
| — | 860-932 | 0–9 XXXall 10 · 8 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | DANIELSON | CT |
| — | 860-935 | 1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NOTHOMPSON | CT |
| — | 860-945 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WATERTOWN | CT |
| — | 860-947 | 4XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-948 | 0XXX8XXX9XXX · 2 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-951 | 1XXX2XXX4XXX5XXX6XXX8XXX9XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-952 | 2XXX3XXX4XXX9XXX · 2 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-953 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-954 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-956 | 3XXX5XXX6XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-957 | 0–9 XXXall 10 · 3 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEWMILFORD | CT |
| — | 860-963 | 8XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | PUTNAM | CT |
| — | 860-974 | 4XXX5XXX6XXX8XXX · 3 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | PUTNAM | CT |
| — | 860-986 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-987 | 2XXX3XXX7XXX8XXX which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
| — | 860-991 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEWBRITAIN | CT |
| — | 860-998 | not yet reported which blocks → | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | HARTFORD | CT |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.