ASN AS18615 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18615?

AS18615 is listed under Mainstream Fiber Networks, LLC.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

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AS18615 Mainstream Fiber Networks, LLC

ASN Lookup Tool

Mainstream Fiber Networks, LLC msfiber.net

US 9 Routes

AS Data

AS18615

AS18615 – Mainstream Fiber Networks, LLC

AS Number	18615
AS Name	MAINSTREAM-FIBER
Organization	Mainstream Fiber Networks, LLC(mfnl-2)
Country	US
Website	msfiber.net
Number of IPv4 Routes	8
Number of IPv6 Routes	1
ASN type	ISP
Registry	ARIN
Date Allocated	2013-11-12

ASN Intelligence API for production workflows

Use ASN data for AS18615 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
38.2.0.0/19	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks	8192
163.182.176.0/20	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	4096
23.252.0.0/20	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	4096
38.194.0.0/18	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks	16384
149.20.248.0/21	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	2048
206.126.242.0/23	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	512
147.160.8.0/21	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	2048
2607:1c80::/32	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	~79×10²⁷
74.116.20.0/22	AS18615	Mainstream Fiber Networks, LLC	Mainstream Fiber Networks, LLC	1024

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       18615
ASName:         MAINSTREAM-FIBER
ASHandle:       AS18615
RegDate:        2013-11-12
Updated:        2016-03-15    
Ref:            https://rdap.arin.net/registry/autnum/18615


OrgName:        Mainstream Fiber Networks, LLC
OrgId:          MFNL-2
Address:        4788 Old State Road 46
City:           Nashville
StateProv:      IN
PostalCode:     47448
Country:        US
RegDate:        2015-12-01
Updated:        2026-02-26
Ref:            https://rdap.arin.net/registry/entity/MFNL-2


OrgDNSHandle: SERPI-ARIN
OrgDNSName:   Serpico, Jon 
OrgDNSPhone:  +1-323-333-7553 
OrgDNSEmail:  jserpico@msfiber.net
OrgDNSRef:    https://rdap.arin.net/registry/entity/SERPI-ARIN

OrgTechHandle: ZLV3-ARIN
OrgTechName:   Vance, Zach Lee
OrgTechPhone:  +1-812-720-9423 
OrgTechEmail:  zvance@msfiber.net
OrgTechRef:    https://rdap.arin.net/registry/entity/ZLV3-ARIN

OrgTechHandle: NBL12-ARIN
OrgTechName:   Lynn, Nathaniel B
OrgTechPhone:  +1-844-752-6736 
OrgTechEmail:  blynn@msfiber.net
OrgTechRef:    https://rdap.arin.net/registry/entity/NBL12-ARIN

OrgDNSHandle: NBL12-ARIN
OrgDNSName:   Lynn, Nathaniel B
OrgDNSPhone:  +1-844-752-6736 
OrgDNSEmail:  blynn@msfiber.net
OrgDNSRef:    https://rdap.arin.net/registry/entity/NBL12-ARIN

OrgNOCHandle: GABRI2-ARIN
OrgNOCName:   Gabriel, Bryan 
OrgNOCPhone:  +1-812-961-2838 
OrgNOCEmail:  bgabriel@msfiber.net
OrgNOCRef:    https://rdap.arin.net/registry/entity/GABRI2-ARIN

OrgTechHandle: GABRI2-ARIN
OrgTechName:   Gabriel, Bryan 
OrgTechPhone:  +1-812-961-2838 
OrgTechEmail:  bgabriel@msfiber.net
OrgTechRef:    https://rdap.arin.net/registry/entity/GABRI2-ARIN

OrgTechHandle: SERPI-ARIN
OrgTechName:   Serpico, Jon 
OrgTechPhone:  +1-323-333-7553 
OrgTechEmail:  jserpico@msfiber.net
OrgTechRef:    https://rdap.arin.net/registry/entity/SERPI-ARIN

OrgAbuseHandle: ABUSE8911-ARIN
OrgAbuseName:   Abuse Complaints
OrgAbusePhone:  +1-812-720-9423 
OrgAbuseEmail:  abuse@msfiber.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE8911-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS6939	Hurricane Electric LLC	US
AS25091	IP Max SA	CH
AS209823	Enki Multimedia EURL	FR
AS17072	TOTAL PLAY TELECOMUNICACIONES SA DE CV	MX
AS64289	Macarne.com	US
AS10242	US Internet Corp	US
AS22462	NOLA BROADBAND LLC	US
AS4230	CLARO S.A.	BR
AS19782	Indiana University	US
AS199524	G-Core Labs S.A.	LU

Upstreams

AS Number	Description	Country
AS25091	IP Max SA	CH
AS6939	Hurricane Electric LLC	US
AS6461	Zayo Bandwidth	US
AS174	Cogent Communications, LLC	US
AS137409	GSL Networks Pty LTD	AU
AS971	PureVoltage Hosting Inc.	US
AS32097	WholeSale Internet, Inc.	US
AS4230	CLARO S.A.	BR