Lumen (Level 3) IP Ranges
Lumen Technologies, formerly Level 3 Communications, operates one of the largest internet backbones in the world under AS3356. It provides Tier 1 transit, enterprise networking, and CDN services globally.
- Provider
- Lumen (Level 3)
- Primary ASN
- AS3356
- Category
- Transit
- Headquarters
- Monroe, LA, USA
Known IP ranges
The following IP prefixes are registered to Lumen (Level 3) or commonly associated with their network. Full prefix sets change over time — use WHOIS Lookup for the authoritative current record for any specific IP.
4.0.0.0/8
8.0.0.0/12
63.208.0.0/12
65.112.0.0/12
67.128.0.0/9
What does a Lumen (Level 3) IP mean in a privacy test?
A Lumen IP (AS3356) typically appears as a transit hop in a traceroute. If it appears as your visible IP, you are likely behind a hosting or enterprise service that uses Lumen transit.
Related tools
Frequently asked questions
What IP ranges does Lumen use?
Lumen operates the historic 4.0.0.0/8 block plus ranges such as 8.0.0.0/12 and 63.208.0.0/12 under AS3356. It also announces routes for many transit customers.
Why does Lumen or Level 3 appear in my traceroute?
AS3356 is a Tier 1 backbone carrying a large share of global traffic. Seeing Lumen or Level 3 hops in a traceroute is completely normal and indicates your path uses Lumen transit.
Is Lumen the same as Level 3?
Yes. Level 3 Communications became CenturyLink and then rebranded as Lumen Technologies. AS3356 is the same backbone network throughout these changes.
How do I look up a Lumen IP address?
Use MyIPScan IP Geolocation Lookup. Lumen IPs return AS3356 (Lumen, formerly Level 3) with the facility location.
What ASN does Lumen use?
Lumen uses AS3356 as its primary backbone ASN. The AS3356 page on MyIPScan covers this Tier 1 network.