ASN AS21581 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21581?

AS21581 is listed under M5 Computer Security.

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?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS21581 M5 Computer Security | IPGeolocation.io

ASN Lookup Tool

M5 Computer Security m5hosting.com

US 22 Routes

AS Data

AS21581

AS21581 – M5 Computer Security

AS Number	21581
AS Name	M5HOSTING
Organization	M5 Computer Security(mcs-227)
Country	US
Website	m5hosting.com
Number of IPv4 Routes	18
Number of IPv6 Routes	4
ASN type	HOSTING
Registry	ARIN
Date Allocated	2008-05-28

ASN Intelligence API for production workflows

Use ASN data for AS21581 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
206.71.169.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
2606:7100:1cab::/48	AS21581	M5 Computer Security	M5 Computer Security	~1×10²⁴
209.216.230.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
2606:7100:3200::/44	AS21581	M5 Computer Security	M5 Computer Security	~19×10²⁴
108.161.145.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
108.161.148.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
206.251.244.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
2606:7100:3100::/44	AS21581	M5 Computer Security	M5 Computer Security	~19×10²⁴
207.158.30.0/24	AS21581	M5 Computer Security	M5 Computer Security	256
206.71.179.0/24	AS21581	M5 Computer Security	M5 Computer Security	256

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:       21581
ASName:         M5HOSTING
ASHandle:       AS21581
RegDate:        2008-05-28
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/21581


OrgName:        M5 Computer Security
OrgId:          MCS-227
Address:        10601 Tierrasanta Blvd #G-135
City:           San Diego
StateProv:      CA
PostalCode:     92124
Country:        US
RegDate:        2005-11-09
Updated:        2025-01-23
Ref:            https://rdap.arin.net/registry/entity/MCS-227


OrgAbuseHandle: ABUSE1898-ARIN
OrgAbuseName:   Abuse
OrgAbusePhone:  +1-877-344-4678 
OrgAbuseEmail:  abuse@m5hosting.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE1898-ARIN

OrgTechHandle: KILLI120-ARIN
OrgTechName:   Killian, John 
OrgTechPhone:  +1-877-344-4678 
OrgTechEmail:  jkillian@m5hosting.com
OrgTechRef:    https://rdap.arin.net/registry/entity/KILLI120-ARIN

RAbuseHandle: ABUSE1898-ARIN
RAbuseName:   Abuse
RAbusePhone:  +1-877-344-4678 
RAbuseEmail:  abuse@m5hosting.com
RAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE1898-ARIN

RTechHandle: MMC112-ARIN
RTechName:   McCafferty, Michael 
RTechPhone:  +1-877-344-4678 
RTechEmail:  mike@m5hosting.com
RTechRef:    https://rdap.arin.net/registry/entity/MMC112-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
AS6130	American Internet Services, LLC.	US
AS174	Cogent Communications, LLC	US
AS11320	LightEdge Solutions	US

Upstreams

AS Number	Description	Country
AS6130	American Internet Services, LLC.	US
AS174	Cogent Communications, LLC	US
AS11320	LightEdge Solutions	US

Contacts

Email Contacts

jkillian@m5hosting.com

Abuse Contacts

abuse@m5hosting.com