% 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/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

NetRange:       159.123.0.0 - 159.123.255.255
CIDR:           159.123.0.0/16
NetName:        SLRHCNET
NetHandle:      NET-159-123-0-0-1
Parent:         NET159 (NET-159-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   St. Luke's Roosevelt Hospital Center (SLHC)
RegDate:        1992-04-14
Updated:        2022-09-06
Ref:            https://rdap.arin.net/registry/ip/159.123.0.0

OrgName:        St. Luke's Roosevelt Hospital Center
OrgId:          SLHC
Address:        555 W 57th Street
Address:        19th Floor IS Suite
City:           New York
StateProv:      NY
PostalCode:     10019
Country:        US
RegDate:        1992-04-14
Updated:        2023-06-20
Ref:            https://rdap.arin.net/registry/entity/SLHC

OrgTechHandle: GUNTH50-ARIN
OrgTechName:   Gunther, Doug 
OrgTechPhone:  +1-212-814-4541 
OrgTechEmail:  doug.gunther@mountsinai.org
OrgTechRef:    https://rdap.arin.net/registry/entity/GUNTH50-ARIN

OrgTechHandle: LEELA29-ARIN
OrgTechName:   Lee, Lap 
OrgTechPhone:  +1-347-918-7314 
OrgTechEmail:  lap.lee@mountsinai.org
OrgTechRef:    https://rdap.arin.net/registry/entity/LEELA29-ARIN

OrgNOCHandle: AP412-ARIN
OrgNOCName:   Pizzimenti, Andrew 
OrgNOCPhone:  +1-917-459-9302 
OrgNOCEmail:  andrew.pizzimenti@mssm.edu
OrgNOCRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

OrgAbuseHandle: AP412-ARIN
OrgAbuseName:   Pizzimenti, Andrew 
OrgAbusePhone:  +1-917-459-9302 
OrgAbuseEmail:  andrew.pizzimenti@mssm.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

OrgAbuseHandle: LEELA29-ARIN
OrgAbuseName:   Lee, Lap 
OrgAbusePhone:  +1-347-918-7314 
OrgAbuseEmail:  lap.lee@mountsinai.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/LEELA29-ARIN

OrgNOCHandle: LEELA29-ARIN
OrgNOCName:   Lee, Lap 
OrgNOCPhone:  +1-347-918-7314 
OrgNOCEmail:  lap.lee@mountsinai.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/LEELA29-ARIN

OrgTechHandle: AP412-ARIN
OrgTechName:   Pizzimenti, Andrew 
OrgTechPhone:  +1-917-459-9302 
OrgTechEmail:  andrew.pizzimenti@mssm.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

RNOCHandle: AP412-ARIN
RNOCName:   Pizzimenti, Andrew 
RNOCPhone:  +1-917-459-9302 
RNOCEmail:  andrew.pizzimenti@mssm.edu
RNOCRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

RTechHandle: AP412-ARIN
RTechName:   Pizzimenti, Andrew 
RTechPhone:  +1-917-459-9302 
RTechEmail:  andrew.pizzimenti@mssm.edu
RTechRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

RTechHandle: LEELA29-ARIN
RTechName:   Lee, Lap 
RTechPhone:  +1-347-918-7314 
RTechEmail:  lap.lee@mountsinai.org
RTechRef:    https://rdap.arin.net/registry/entity/LEELA29-ARIN

RAbuseHandle: AP412-ARIN
RAbuseName:   Pizzimenti, Andrew 
RAbusePhone:  +1-917-459-9302 
RAbuseEmail:  andrew.pizzimenti@mssm.edu
RAbuseRef:    https://rdap.arin.net/registry/entity/AP412-ARIN

RAbuseHandle: LEELA29-ARIN
RAbuseName:   Lee, Lap 
RAbusePhone:  +1-347-918-7314 
RAbuseEmail:  lap.lee@mountsinai.org
RAbuseRef:    https://rdap.arin.net/registry/entity/LEELA29-ARIN

RNOCHandle: LEELA29-ARIN
RNOCName:   Lee, Lap 
RNOCPhone:  +1-347-918-7314 
RNOCEmail:  lap.lee@mountsinai.org
RNOCRef:    https://rdap.arin.net/registry/entity/LEELA29-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.
#