Autonomous system
AS18615 MAINSTREAM-FIBER
Unclassified ARIN
Summary
Mainstream Fiber Networks
residential fiber isp us
MAINSTREAM-FIBER is operated by Mainstream Fiber Networks, LLC.
What it's used for
- The address space carries residential fiber-to-the-home services, evidenced by reverse DNS entries such as
23-252-11-254-cstmr.msfiber.netand netnames likeMFN-CGNT-NET-1. - The AS announces 38,400 IPv4 addresses across 8 prefixes and 1 IPv6 prefix, while maintaining 12 observed neighbours; this ratio of high address volume to moderate peering suggests an access network serving end-users rather than a transit provider.
Notable
- All RDAP registrants for the announced prefixes are listed as Mainstream Fiber Networks, LLC, aligning perfectly with the AS holder.
- The inventory consists of eight distinct IPv4 blocks, including a large /18 and several /20s and /21s, indicating a consolidated corporate estate for its fiber infrastructure.
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
Recorded at 3 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| DE-CIX Dallas | Dallas, United States | 206.53.202.94 |
| DE-CIX Chicago | Chicago, United States | 149.112.11.17 |
| FD-IX - Indianapolis | Indianapolis, United States | 206.53.139.39 |
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 8 prefixes · 38.40K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 9 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS18615- Registry name
- MAINSTREAM-FIBER
- Registrant
- Mainstream Fiber Networks, LLC
- Abuse contact
- abuse@msfiber.net
- Registered
- 2013-11-12
- Last changed
- 2016-03-15
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 78% valid · 7 valid, 2 with no ROA
- ROAs
- 7 authorising AS18615
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 16 naming AS18615
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.
No DROP prefixes None of its announced space is on the DROP prefix list.
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