4043 MIC-ASN, US
Adjacency: 5 Upstream: 4 Downstream: 1
Upstream Adjacent AS list
AS293 ESNET, US
AS3130 RGNET-SEA RGnet Seattle Westin, EE
AS6939 HURRICANE, US
AS6461 ZAYO-6461, US
Downstream Adjacent AS list
AS399986 SPH-HELENA-MT-01, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 6066 AS4043 ORG+TRN Originate: 25344 /17.37 Transit: 256 /24.00 MIC-ASN, US
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 31189 AS4043 MIC-ASN, US 4 0 0 4 0 0.00% Prefix AS Path Aggregation Suggestion 199.5.172.0/24 293 4043 205.207.148.0/23 6939 4043 206.127.64.0/18 293 4043 209.161.128.0/19 293 4043
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS4043 4 More Specifics 7 Total Advertisements MIC-ASN, US
206.127.64.0/19 206.127.64.0/18
206.127.96.0/19 206.127.64.0/18
209.161.128.0/20 209.161.128.0/19
209.161.144.0/20 209.161.128.0/19
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 206.127.64.0/19 Announced
+ 206.127.96.0/19 Announced
+ 209.161.128.0/20 Announced
+ 209.161.144.0/20 Announced
whois: 402603
IANA has recorded AS4043 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS4043\n
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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: +1-406-443-3347
OrgTechEmail: josh@mic.mt.net
OrgTechRef: https://rdap.arin.net/registry/entity/JOSHU24-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
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
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
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# 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/
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# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
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