% APNIC found the following authoritative answer from: whois.arin.net

#
# 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.
#

NetRange:       167.73.0.0 - 167.73.255.255
CIDR:           167.73.0.0/16
NetName:        SPECTRUM-HEALTH
NetHandle:      NET-167-73-0-0-1
Parent:         NET167 (NET-167-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   Spectrum Health (SPECT-19-Z)
RegDate:        1993-05-11
Updated:        2025-08-11
Comment:        -----BEGIN CERTIFICATE-----
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Comment:        MzM0MzlaMIGhMQswCQYDVQQGEwJVUzERMA8GA1UECAwITWljaGlYW4xFTATBgNV
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Comment:        SdJhyAzcDLas
Comment:        -----END CERTIFICATE-----
Ref:            https://rdap.arin.net/registry/ip/167.73.0.0

OrgName:        Spectrum Health
OrgId:          SPECT-19-Z
Address:        100 Michigan St NE
Address:        Mail Code 064
City:           Grand Rapids
StateProv:      MI
PostalCode:     49503
Country:        US
RegDate:        2009-03-25
Updated:        2025-07-31
Ref:            https://rdap.arin.net/registry/entity/SPECT-19-Z

OrgTechHandle: TELEC3-ARIN
OrgTechName:   Telecommunications Manager
OrgTechPhone:  +1-616-486-4888 
OrgTechEmail:  network.administrator@corewellhealth.org
OrgTechRef:    https://rdap.arin.net/registry/entity/TELEC3-ARIN

OrgTechHandle: TOROD-ARIN
OrgTechName:   Torode, David 
OrgTechPhone:  +1-248-766-2584 
OrgTechEmail:  david.torode@corewellhealth.org
OrgTechRef:    https://rdap.arin.net/registry/entity/TOROD-ARIN

OrgTechHandle: NETWO425-ARIN
OrgTechName:   Network Administrators
OrgTechPhone:  +1-616-486-4888 
OrgTechEmail:  network.administrator@corewellhealth.org
OrgTechRef:    https://rdap.arin.net/registry/entity/NETWO425-ARIN

OrgTechHandle: GRESH26-ARIN
OrgTechName:   Gresham, William 
OrgTechPhone:  +1-616-460-5274 
OrgTechEmail:  william.gresham@corewellhealth.org
OrgTechRef:    https://rdap.arin.net/registry/entity/GRESH26-ARIN

OrgAbuseHandle: NETWO425-ARIN
OrgAbuseName:   Network Administrators
OrgAbusePhone:  +1-616-486-4888 
OrgAbuseEmail:  network.administrator@corewellhealth.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO425-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.
#