Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
CAMBRIDGE prefixes in area code 617
NANPA records 111 assigned NXX blocks to rate center CAMBRIDGE in area code 617, 14.5% of the 768 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 17 holders hold those blocks, the largest being VERIZON NEW ENGLAND INC. (46), OMNIPOINT MIAMI E LICENSE, LLC (12), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (10). The earliest assignment on record here is 2001-02-14 and the most recent 2018-01-08. 61 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 208, 308, 309, 410 – overlay codes cover the same geography, so a rate center is served by all of them.
111 assigned blocks – 14.5% of 617
17 holders of record
61 of them pooled in 1,000-number lots
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 617-201 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | 2001-02-14 | yes | yes |
| 617-216 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-218 | AT&T TC SYSTEMS, INC. | – | yes | yes |
| 617-225 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-229 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-230 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | no | yes |
| 617-233 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-234 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-245 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MA | – | yes | yes |
| 617-250 | AT&T TC SYSTEMS, INC. | – | yes | yes |
| 617-251 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | 2001-02-14 | yes | yes |
| 617-252 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-253 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-256 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-258 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-280 | NEP, LLC | 2003-09-29 | no | yes |
| 617-290 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-299 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-300 | AT&T TC SYSTEMS, INC. | – | yes | yes |
| 617-301 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2004-07-13 | yes | yes |
| 617-308 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-324 | Verizon VERIZON NEW ENGLAND INC. | 2002-08-08 | yes | yes |
| 617-335 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-339 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-349 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-354 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-359 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-374 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-384 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-386 | AT&T TC SYSTEMS, INC. | 2001-12-15 | yes | yes |
| 617-388 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-395 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MA | – | yes | yes |
| 617-397 | AT&T TC SYSTEMS, INC. | – | yes | yes |
| 617-401 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MA | – | yes | yes |
| 617-417 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2001-02-16 | yes | yes |
| 617-430 | Bandwidth BANDWIDTH.COM CLEC, LLC - MA | – | yes | yes |
| 617-441 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-444 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-452 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-453 | Bandwidth BANDWIDTH.COM CLEC, LLC - MA | – | yes | yes |
| 617-460 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | yes | yes |
| 617-465 | Bandwidth BANDWIDTH.COM CLEC, LLC - MA | – | yes | yes |
| 617-468 | Bandwidth BANDWIDTH.COM CLEC, LLC - MA | – | yes | yes |
| 617-475 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-491 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-492 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-493 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-494 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-495 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-496 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-497 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-498 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-499 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-500 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MA | – | yes | yes |
| 617-503 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-520 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-528 | AT&T TC SYSTEMS, INC. | – | yes | yes |
| 617-540 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-547 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-551 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-575 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-576 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-577 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-583 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MA | – | yes | yes |
| 617-588 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | no | yes |
| 617-599 | Verizon VERIZON NEW ENGLAND INC. | 2001-02-28 | yes | yes |
| 617-613 | AT&T TC SYSTEMS, INC. | – | no | yes |
| 617-621 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-642 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | no | yes |
| 617-647 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 617-649 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-661 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-665 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-674 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 617-679 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-682 | YMAX COMMUNICATIONS CORP. - MA | – | yes | yes |
| 617-685 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 2018-01-08 | yes | yes |
| 617-693 | Onvoy ONVOY, LLC - MA | – | yes | yes |
| 617-703 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 617-710 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-714 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-715 | Windstream PAETEC ITEL, LLC | – | no | yes |
| 617-758 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 617-761 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-768 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-798 | Bandwidth BANDWIDTH.COM CLEC, LLC - MA | – | yes | yes |
| 617-800 | RCN TELECOM SERVICES, INC. - MA | – | yes | yes |
| 617-802 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-803 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-806 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-812 | Onvoy ONVOY, LLC - MA | – | no | yes |
| 617-821 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 617-836 | NORFOLK COUNTY INTERNET, INC. | – | no | yes |
| 617-844 | Windstream PAETEC ITEL, LLC | – | no | yes |
| 617-852 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-864 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-866 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 617-868 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-871 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 617-873 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-876 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 617-899 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-902 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 617-909 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 617-914 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | no | yes |
| 617-945 | Comcast COMCAST IP PHONE, LLC | – | yes | yes |
| 617-949 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 617-955 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2005-05-09 | yes | yes |
| 617-995 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | no | yes |
| 617-998 | Verizon VERIZON NEW ENGLAND INC. | 2001-06-21 | no | yes |
| 617-999 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | – | yes | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| VERIZON NEW ENGLAND INC. | Verizon | 46 | 41.4% |
| OMNIPOINT MIAMI E LICENSE, LLC | T-Mobile | 12 | 10.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 10 | 9% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 10 | 9% |
| TC SYSTEMS, INC. | AT&T | 7 | 6.3% |
| LEVEL 3 COMMUNICATIONS, LLC - MA | Lumen | 5 | 4.5% |
| BANDWIDTH.COM CLEC, LLC - MA | Bandwidth | 5 | 4.5% |
| PAETEC ITEL, LLC | Windstream | 5 | 4.5% |
| AMERICAN MESSAGING SERVICES, LLC | American Messaging | 2 | 1.8% |
| ONVOY, LLC - MA | Onvoy | 2 | 1.8% |
| NEP, LLC | – | 1 | 0.9% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 0.9% |
| YMAX COMMUNICATIONS CORP. - MA | – | 1 | 0.9% |
| RCN TELECOM SERVICES, INC. - MA | – | 1 | 0.9% |
| NORFOLK COUNTY INTERNET, INC. | – | 1 | 0.9% |
| COMCAST IP PHONE, LLC | Comcast | 1 | 0.9% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | Verizon | 1 | 0.9% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to CAMBRIDGE in area code 617?
111 blocks: 201, 216, 218, 225, 229, 230, 233, 234, 245, 250, 251, 252 and 99 more, all listed in the table above.
Which carriers have numbers in CAMBRIDGE?
VERIZON NEW ENGLAND INC. (46 blocks), OMNIPOINT MIAMI E LICENSE, LLC (12 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (10 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (10 blocks), TC SYSTEMS, INC. (7 blocks), LEVEL 3 COMMUNICATIONS, LLC - MA (5 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is CAMBRIDGE a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.