NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

SAN MARTIN prefixes in area code 408

NANPA records 15 assigned NXX blocks to rate center SAN MARTIN in area code 408, 1.9% of the 787 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. 8 holders hold those blocks, the largest being PACIFIC BELL (5), BANDWIDTH.COM CLEC, LLC - CA (2), T-MOBILE USA, INC. (2). The earliest assignment on record here is 2001-05-17 and the most recent 2023-05-09. 15 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 code 669 – overlay codes cover the same geography, so a rate center is served by all of them.

15 assigned blocks – 1.9% of 408
8 holders of record
15 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
408-214 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2011-08-04 yes yes
408-312 Dish BOOST SUBSCRIBERCO L.L.C. 2023-05-09 yes yes
408-422 T-Mobile T-MOBILE USA, INC. – yes yes
408-461 T-Mobile T-MOBILE USA, INC. 2001-05-17 yes yes
408-634 Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA – yes yes
408-657 Bandwidth BANDWIDTH.COM CLEC, LLC - CA – yes yes
408-676 Onvoy ONVOY, LLC - CA – yes yes
408-681 AT&T PACIFIC BELL – yes yes
408-682 AT&T PACIFIC BELL – yes yes
408-683 AT&T PACIFIC BELL – yes yes
408-686 AT&T PACIFIC BELL – yes yes
408-692 Onvoy ONVOY, LLC - CA – yes yes
408-695 AT&T PACIFIC BELL – yes yes
408-837 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
408-909 Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA 2013-03-08 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

HolderBrandBlocksShare here
PACIFIC BELL AT&T 5 33.3%
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 2 13.3%
T-MOBILE USA, INC. T-Mobile 2 13.3%
ONVOY, LLC - CA Onvoy 2 13.3%
BOOST SUBSCRIBERCO L.L.C. Dish 1 6.7%
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA Lumen 1 6.7%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 6.7%
PEERLESS NETWORK OF CALIFORNIA, LLC - CA Peerless 1 6.7%

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 SAN MARTIN in area code 408?

15 blocks: 214, 312, 422, 461, 634, 657, 676, 681, 682, 683, 686, 692 and 3 more, all listed in the table above.

Which carriers have numbers in SAN MARTIN?

PACIFIC BELL (5 blocks), BANDWIDTH.COM CLEC, LLC - CA (2 blocks), T-MOBILE USA, INC. (2 blocks), ONVOY, LLC - CA (2 blocks), BOOST SUBSCRIBERCO L.L.C. (1 block), LEVEL 3 TELECOM OF CALIFORNIA, LP - CA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SAN MARTIN 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.

Other rate centers in 408

All 787 prefixes in 408