What is Lumen Technologies?

Lumen Technologies is a US toll free Responsible Organization (RespOrg) identified by code SD. They manage and assign toll free numbers on behalf of business customers.

How many toll free numbers does Lumen Technologies have?

Lumen Technologies (SD) manages 13 active toll free numbers as of 2026-06, according to the Somos toll free registry tracked by Resporgs.com.

How do I request a specific toll free number from Lumen Technologies?

Resporgs.com hosts a request form for Lumen Technologies at https://resporgs.com/ask/SD. Fill in the number you want and your contact details; we'll route the request to the appropriate party.

RespOrg directory

Lumen Technologies

alias: Century LInk

Large Telcom Dormant Group: Lumen

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Transfer network

How toll free numbers move between Lumen Technologies (SD) and other Resp Orgs, reconstructed from Somos registry snapshots. Larger nodes = more transfer volume; Lumen Technologies is highlighted. Open the full interactive map →

Scroll to zoom, drag to pan, drag a node to reposition.

Transfer Funnel (acquired at a drop, then moved on) Off-hours fast pickup

Website, visit, full size

Based in Arlington Heights, IL, street view, full size

Based in Arlington Heights, IL, satellite, full size

Website: https://www.lumen.com/ Domain since 1994 (32y)
Phone: (877) 453-8353 via web search: lumen.com
👥 Shared address (5 resporgs)

At a glance

Active numbers

#468 of 481

Change over 4 years

-1,090

-98.8%

Opportunism Index

0.00%

Harvested 0 / acquired 29

Sub-codes in use

SDR01

Dormant RespOrg

This phone company is dead or nearly dead, almost zero numbers and little or no activity. Sometimes called a "zombie" RespOrg because they just won't die.

Last seen with active numbers: 2020-01. Nothing in any monthly snapshot since.

The trajectory chart below shows the full history. The code may have been transferred, retired, or reassigned to a new operator that hasn't begun activating numbers yet.

Trajectory

Total active inventory Numbers harvested from disconnect pool that month

Show monthly numbers

Month	Inventory	Acquired	Lost	From spare	To spare
2018-03	1,103	0	0	0	0
2018-06	1,103	0	0	0	0
2018-09	1,097	0	6	0	0
2018-10	1,096	0	1	0	0
2018-11	1,096	0	0	0	0
2018-12	1,096	0	0	0	0
2019-01	1,096	0	0	0	0
2019-02	1,096	0	0	0	0
2019-03	1,096	0	0	0	0
2019-04	1,094	0	2	0	0
2019-05	1,094	0	0	0	0
2019-06	1,094	0	0	0	0
2019-08	1,065	0	29	0	29
2019-09	1,094	29	0	29	0
2019-10	1,094	0	0	0	0
2019-11	1,093	0	1	0	0
2019-12	1,093	0	0	0	0
2020-01	1,093	0	0	0	0
2020-02	13	0	1,080	0	0
2020-03	13	0	0	0	0
2020-04	13	0	0	0	0
2020-05	13	0	0	0	0
2020-06	13	0	0	0	0
2020-07	13	0	0	0	0
2020-08	13	0	0	0	0
2020-09	13	0	0	0	0
2020-10	13	0	0	0	0
2020-11	13	0	0	0	0
2020-12	13	0	0	0	0
2021-01	13	0	0	0	0
2021-02	13	0	0	0	0
2021-03	13	0	0	0	0
2021-04	13	0	0	0	0
2021-05	13	0	0	0	0
2022-05	13	0	0	0	0
2022-06	13	0	0	0	0
2022-07	13	0	0	0	0
2022-08	13	0	0	0	0
2022-09	13	0	0	0	0
2022-10	13	0	0	0	0
2022-11	13	0	0	0	0
2022-12	13	0	0	0	0
2023-01	13	0	0	0	0
2023-02	13	0	0	0	0
2023-03	13	0	0	0	0
2023-04	13	0	0	0	0
2023-05	13	0	0	0	0
2023-06	13	0	0	0	0
2023-07	13	0	0	0	0
2023-08	13	0	0	0	0
2023-09	13	0	0	0	0
2023-10	13	0	0	0	0
2023-11	13	0	0	0	0
2023-12	13	0	0	0	0
2024-02	13	0	0	0	0
2024-03	13	0	0	0	0
2024-04	13	0	0	0	0
2024-05	13	0	0	0	0
2024-06	13	0	0	0	0
2024-07	13	0	0	0	0
2024-08	13	0	0	0	0
2024-09	13	0	0	0	0
2024-10	13	0	0	0	0
2024-11	13	0	0	0	0
2024-12	13	0	0	0	0
2025-01	13	0	0	0	0
2025-02	13	0	0	0	0
2025-03	13	0	0	0	0
2025-04	13	0	0	0	0
2025-05	13	0	0	0	0
2025-06	13	0	0	0	0
2025-07	13	0	0	0	0
2025-08	13	0	0	0	0
2025-09	13	0	0	0	0
2025-10	13	0	0	0	0
2025-11	13	0	0	0	0
2025-12	13	0	0	0	0
2026-01	13	0	0	0	0
2026-02	13	0	0	0	0
2026-03	13	0	0	0	0
2026-04	13	0	0	0	0
2026-05	13	0	0	0	0
2026-06	13	0	0	0	0

Flow patterns (42-month cumulative)

Inbound (numbers acquired)

Direct transfer from another RespOrg	0.0
Harvested from disconnect pool	0.0
First assigned from spare pool	58.0
Reactivated own disconnects	0.0

Outbound (numbers lost)

Direct transfer to another RespOrg	1,090.0
Entered multi-month disconnect (aging)	0.0
Released directly to spare pool	29.0

Top direct-transfer destinations (OUT of SD)

AL	1,080.0	Lumen Technologies (Lumen)
AT	8.0	AT&T
WW	2.0	Inteliquent

Summary

Formerly Century Link, among other names, Lumen is a large telecom company that's grown through numerous acquisitions and of course has multiple resporgs and systems and probably numerous numbers lost in the cracks. They also work with a number of resellers, though not as much as they used to. This makes finding the right segment of the company and the actual company providing the service especially hard.

Contact-form message

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