% 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:       192.243.80.0 - 192.243.95.255
CIDR:           192.243.80.0/20
NetName:        MGEHL-NET-BLOCK-01
NetHandle:      NET-192-243-80-0-1
Parent:         NET192 (NET-192-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   McGraw-Hill Education (MGEHL)
RegDate:        2013-07-25
Updated:        2026-06-18
Comment:        -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
Ref:            https://rdap.arin.net/registry/ip/192.243.80.0

OrgName:        McGraw-Hill Education
OrgId:          MGEHL
Address:        1325 6th ave
City:           New York
StateProv:      NY
PostalCode:     10019
Country:        US
RegDate:        2013-06-07
Updated:        2025-08-27
Ref:            https://rdap.arin.net/registry/entity/MGEHL

OrgTechHandle: KONUJ1-ARIN
OrgTechName:   Konujeti, Dinesh 
OrgTechPhone:  +1-732-485-0165 
OrgTechEmail:  dinesh.konujeti@mheducation.com
OrgTechRef:    https://rdap.arin.net/registry/entity/KONUJ1-ARIN

OrgTechHandle: WANGA38-ARIN
OrgTechName:   Wang, Adam 
OrgTechPhone:  +1-732-284-8394 
OrgTechEmail:  adam.wang@mheducation.com
OrgTechRef:    https://rdap.arin.net/registry/entity/WANGA38-ARIN

OrgNOCHandle: MHENE-ARIN
OrgNOCName:   MHE-Network
OrgNOCPhone:  +1-732-485-0165 
OrgNOCEmail:  networkservices@mheducation.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/MHENE-ARIN

OrgAbuseHandle: MAOC-ARIN
OrgAbuseName:   MHE Abuse Operations Center
OrgAbusePhone:  +1-617-859-6003 
OrgAbuseEmail:  abuse@mheducation.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MAOC-ARIN

RNOCHandle: MNOC10-ARIN
RNOCName:   MHE Network Operations Center
RNOCPhone:  +1-617-859-6003 
RNOCEmail:  noc@mheducation.com
RNOCRef:    https://rdap.arin.net/registry/entity/MNOC10-ARIN

RAbuseHandle: MAOC-ARIN
RAbuseName:   MHE Abuse Operations Center
RAbusePhone:  +1-617-859-6003 
RAbuseEmail:  abuse@mheducation.com
RAbuseRef:    https://rdap.arin.net/registry/entity/MAOC-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.
#