ASN AS4043 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS4043?

AS4043 is listed under Montana Internet Corporation.

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.

AS4043 Montana Internet Corporation

ASN Lookup Tool

Montana Internet Corporation mt.net

US 5 Routes

AS Data

AS4043

AS4043 – Montana Internet Corporation

AS Number	4043
AS Name	MIC-ASN
Organization	Montana Internet Corporation (mic-z)
Country	US
Website	mt.net
Number of IPv4 Routes	4
Number of IPv6 Routes	1
ASN type	ISP
Registry	ARIN
Date Allocated	1994-11-17

ASN Intelligence API for production workflows

Use ASN data for AS4043 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

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
206.127.64.0/18	AS4043	Montana Internet Corporation	Montana Internet Corporation	16384
2607:f6b8::/32	AS4043	Montana Internet Corporation	Montana Internet Corporation	~79×10²⁷
205.207.148.0/23	AS4043	Montana Internet Corporation	Montana Internet Corporation	512
199.5.172.0/24	AS4043	Montana Internet Corporation	Carroll College	256
209.161.128.0/19	AS4043	Montana Internet Corporation	Montana Internet Corporation	8192

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:       4043
ASName:         MIC-ASN
ASHandle:       AS4043
RegDate:        1994-11-17
Updated:        2023-12-29
Ref:            https://rdap.arin.net/registry/autnum/4043


OrgName:        Montana Internet Corporation
OrgId:          MIC-Z
Address:        1424 National Ave
City:           Helena
StateProv:      MT
PostalCode:     59601
Country:        US
RegDate:        2023-12-19
Updated:        2025-08-22
Ref:            https://rdap.arin.net/registry/entity/MIC-Z


OrgTechHandle: JOSHU24-ARIN
OrgTechName:   Romandia, Joshua A
OrgTechPhone:  +1-916-895-1782 
OrgTechEmail:  josh@mic.mt.net
OrgTechRef:    https://rdap.arin.net/registry/entity/JOSHU24-ARIN

OrgNOCHandle: NANC-ARIN
OrgNOCName:   Network Abuse and NOC Contact
OrgNOCPhone:  +1-406-449-3345 
OrgNOCEmail:  support@mt.net
OrgNOCRef:    https://rdap.arin.net/registry/entity/NANC-ARIN

OrgTechHandle: FWC-ARIN
OrgTechName:   Christian, Forrest 
OrgTechPhone:  +1-406-449-3345 
OrgTechEmail:  forrestc@imach.com
OrgTechRef:    https://rdap.arin.net/registry/entity/FWC-ARIN

OrgAbuseHandle: NANC-ARIN
OrgAbuseName:   Network Abuse and NOC Contact
OrgAbusePhone:  +1-406-449-3345 
OrgAbuseEmail:  support@mt.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NANC-ARIN

RTechHandle: FWC-ARIN
RTechName:   Christian, Forrest 
RTechPhone:  +1-406-449-3345 
RTechEmail:  forrestc@imach.com
RTechRef:    https://rdap.arin.net/registry/entity/FWC-ARIN

RTechHandle: AU8-ARIN
RTechName:   Utick, Andy 
RTechPhone:  +1-406-443-3347 
RTechEmail:  AUTICK@mt.net
RTechRef:    https://rdap.arin.net/registry/entity/AU8-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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "4043",
    "as_handle" : "AS4043",
    "as_name" : "MIC-ASN",
    "tech_contacts" : [ "JOSHU24-ARIN", "FWC-ARIN", "FWC-ARIN", "AU8-ARIN" ],
    "abuse_contacts" : [ "NANC-ARIN" ],
    "date_created" : "1994-11-17",
    "date_updated" : "2023-12-29",
    "source" : "https://rdap.arin.net/registry/autnum/4043"
  } ],
  "organization" : {
    "handle" : "MIC-Z",
    "name" : "Montana Internet Corporation",
    "address" : [ "1424 National Ave", "Helena", "MT", "59601", "US" ],
    "street" : "National Ave",
    "city" : "Helena",
    "state" : "MT",
    "zip_code" : "59601",
    "country" : [ "US" ],
    "date_created" : "2023-12-19",
    "date_updated" : "2025-08-22",
    "source" : "https://rdap.arin.net/registry/entity/MIC-Z",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "JOSHU24-ARIN",
    "name" : "Romandia, Joshua A",
    "email" : [ "josh@mic.mt.net" ],
    "phone" : [ "+1-916-895-1782" ],
    "source" : "https://rdap.arin.net/registry/entity/JOSHU24-ARIN"
  }, {
    "handle" : "FWC-ARIN",
    "name" : "Christian, Forrest",
    "email" : [ "forrestc@imach.com" ],
    "phone" : [ "+1-406-449-3345" ],
    "source" : "https://rdap.arin.net/registry/entity/FWC-ARIN"
  }, {
    "handle" : "AU8-ARIN",
    "name" : "Utick, Andy",
    "email" : [ "AUTICK@mt.net" ],
    "phone" : [ "+1-406-443-3347" ],
    "source" : "https://rdap.arin.net/registry/entity/AU8-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "NANC-ARIN",
    "name" : "Network Abuse and NOC Contact",
    "email" : [ "support@mt.net" ],
    "phone" : [ "+1-406-449-3345" ],
    "source" : "https://rdap.arin.net/registry/entity/NANC-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS58511	Anycast Global Backbone	AU
AS24482	SG.GS	SG
AS3786	LG DACOM Corporation	KR
AS399986	St. Peter's Health	US
AS393577	Tritan Development	US
AS401703	Ordinal Advisors LLC	US
AS6939	Hurricane Electric LLC	US
AS20473	The Constant Company, LLC	US
AS64289	Macarne.com	US
AS10242	US Internet Corp	US

Upstreams

AS Number	Description	Country
AS52025	ParadoxNetworks Limited	GB
AS7575	Australian Academic and Research Network	AU
AS394256	Tech Futures Interactive Inc.	CA
AS9002	RETN Limited	GB
AS6939	Hurricane Electric LLC	US
AS6461	Zayo Bandwidth	US
AS137409	GSL Networks Pty LTD	AU

Downstreams

AS Number	Description	Country
AS399986	St. Peter's Health	US