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

FORTLUPTON prefixes in area code 303

NANPA records 11 assigned NXX blocks to rate center FORTLUPTON in area code 303, 1.4% of the 784 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. 5 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC (4), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO (4), ONVOY, LLC - CO (1). The earliest assignment on record here is 2001-09-13 and the most recent 2008-06-13. 9 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 720, 983 – overlay codes cover the same geography, so a rate center is served by all of them.

11 assigned blocks – 1.4% of 303
5 holders of record
9 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
303-304 AT&T NEW CINGULAR WIRELESS PCS, LLC 2004-11-18 yes yes
303-502 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 2005-12-13 yes yes
303-506 AT&T NEW CINGULAR WIRELESS PCS, LLC 2001-09-13 yes yes
303-535 Onvoy ONVOY, LLC - CO – yes yes
303-710 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO – yes yes
303-717 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
303-718 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO – yes yes
303-720 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 2008-06-13 yes yes
303-857 Lumen QWEST CORPORATION – yes yes
303-956 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
303-990 T-Mobile T-MOBILE USA, INC. 2006-05-16 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
NEW CINGULAR WIRELESS PCS, LLC AT&T 4 36.4%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO Verizon 4 36.4%
ONVOY, LLC - CO Onvoy 1 9.1%
QWEST CORPORATION Lumen 1 9.1%
T-MOBILE USA, INC. T-Mobile 1 9.1%

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 FORTLUPTON in area code 303?

11 blocks: 304, 502, 506, 535, 710, 717, 718, 720, 857, 956, 990. The table above gives the holder of each.

Which carriers have numbers in FORTLUPTON?

NEW CINGULAR WIRELESS PCS, LLC (4 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO (4 blocks), ONVOY, LLC - CO (1 block), QWEST CORPORATION (1 block), T-MOBILE USA, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is FORTLUPTON 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 303

All 784 prefixes in 303