This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS21712 1 More Specifics 2 Total Advertisements ASN-SJHC, US
205.167.128.0/24 205.167.128.0/23
whois: 402590
IANA has recorded AS21712 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21712\n
#
# 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.
#
ASNumber: 21712
ASName: ASN-SJHC
ASHandle: AS21712
RegDate: 2007-04-23
Updated: 2017-10-31
Ref: https://rdap.arin.net/registry/autnum/21712
OrgName: CommonSpirit Health
OrgId: CHI-19
Address: 11045 E. Lansing Circle
City: Englewood
StateProv: CO
PostalCode: 80112
Country: US
RegDate: 2001-06-21
Updated: 2025-09-19
Ref: https://rdap.arin.net/registry/entity/CHI-19
OrgTechHandle: EDDYM4-ARIN
OrgTechName: Eddy, Michael
OrgTechPhone: +1-623-428-9250
OrgTechEmail: mike.eddy@commonspirit.org
OrgTechRef: https://rdap.arin.net/registry/entity/EDDYM4-ARIN
OrgAbuseHandle: MURAT6-ARIN
OrgAbuseName: Murataj, Ardit
OrgAbusePhone: +1-720-875-7784
OrgAbuseEmail: ardit.murataj@commonspirit.org
OrgAbuseRef: https://rdap.arin.net/registry/entity/MURAT6-ARIN
OrgTechHandle: HERMA212-ARIN
OrgTechName: Herman, Jacob
OrgTechPhone: +1-888-307-0222
OrgTechEmail: jacob.herman@commonspirit.org
OrgTechRef: https://rdap.arin.net/registry/entity/HERMA212-ARIN
OrgTechHandle: MURAT6-ARIN
OrgTechName: Murataj, Ardit
OrgTechPhone: +1-720-875-7784
OrgTechEmail: ardit.murataj@commonspirit.org
OrgTechRef: https://rdap.arin.net/registry/entity/MURAT6-ARIN
OrgAbuseHandle: CNA91-ARIN
OrgAbuseName: CommonSpirit Network Abuse
OrgAbusePhone: +1-888-307-0222
OrgAbuseEmail: network-abuse@commonspirit.org
OrgAbuseRef: https://rdap.arin.net/registry/entity/CNA91-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.
#