Autonomous system
AS10753 LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE
Unclassified DROP-listed space ARIN
Summary
Lumen (Level 3) legacy customer shared-use ASN
legacy
LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE is registered to Level 3 Parent, LLC (now part of Lumen), and the handle says exactly what it is: a shared-use AS number in the sense of RFC 2270. It does not represent one network. It is a single AS number that Lumen lends to many separate, unrelated customers who buy transit only from Lumen and need their space originated somewhere.
What it's used for
Because it is shared, this ASN is one of the rare cases where the routing table actively misleads. RIS observes 733 announced IPv4 prefixes carrying 593,664 addresses, 17 IPv6 prefixes, and 61 observed neighbours — numbers that would suggest a large carrier if you read them as one organisation. They are not one organisation. They are hundreds of independent end customers, each single-homed to Lumen, whose prefixes all happen to be originated from the same borrowed number.
The practical consequences matter for anyone consuming this data:
- It cannot be geolocated as a unit. Its prefixes land wherever the individual customers are.
- It cannot be classified as a unit. One
/24in here may be a hospital, the next a county government, the next a small hosting shop. - Its size means nothing about Lumen. These are customer routes, not Lumen backbone.
The announced space bears this out — it is a jumble of unrelated legacy blocks (164.156.0.0/16, 138.15.0.0/16, 147.207.0.0/17, 199.20.128.0/17 and hundreds more) with no common structure, exactly what you would expect from an aggregation of separate assignments.
Notable
RFC 2270, published in 1998, exists precisely so that a provider does not have to burn a globally unique AS number on every single-homed customer. AS numbers used this way are the main reason "which AS is this IP in?" is sometimes an unanswerable question about who actually operates a network.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
12 upstream, 49 downstream and 64 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 709 prefixes · 615K addresses IPv6 13 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 722 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS10753- Registry name
- LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE
- Registrant
- Level 3 Parent, LLC
- Abuse contact
- abuse@level3.com
- Registered
- 1997-11-18
- Last changed
- 2021-08-19
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 42% valid · 476 valid, 648 with no ROA 4 RPKI-invalid
- ROAs
- 551 authorising AS10753
- ASPA
- no ASPA record
- IRR
- 43% registered · 483 of 1,128 announcements 66 other origin
- Route objects
- 832 naming AS10753
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
1 DROP match Announced space overlapping the DROP prefix list.
| Announced | DROP entry | Record |
|---|---|---|
| 185.192.36.0/22 | 185.192.36.0/22 | SBL412029 |
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,768 prefixes, as published 2026-10-12. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere