% 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 1997-2024, American Registry for Internet Numbers, Ltd.
#

NetRange:       12.0.0.0 - 12.255.255.255
CIDR:           12.0.0.0/8
NetName:        ATT
NetHandle:      NET-12-0-0-0-1
Parent:         NET12 (NET-12-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   AT&T Services, Inc. (ATTW-Z)
RegDate:        1983-08-23
Updated:        2024-07-30
Comment:        For abuse issues contact abuse@att.net
Ref:            https://rdap.arin.net/registry/ip/12.0.0.0

OrgName:        AT&T Services, Inc.
OrgId:          ATTW-Z
Address:        200 S. Laurel AVE.
City:           MIDDLETOWN
StateProv:      NJ
PostalCode:     07748
Country:        US
RegDate:        2009-12-18
Updated:        2024-05-28
Comment:        Contact AT&T Abuse ( abuse@att.net ) for policy abuse issues.
Comment:        All policy abuse issues sent to other POCs will be disregarded.
Ref:            https://rdap.arin.net/registry/entity/ATTW-Z

OrgTechHandle: ICC-ARIN
OrgTechName:   IP Team
OrgTechPhone:  +1-888-876-2382 
OrgTechEmail:  rm-ipspecialist@att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ICC-ARIN

OrgAbuseHandle: ATTAB-ARIN
OrgAbuseName:   ATT Abuse
OrgAbusePhone:  +1-999-999-9999 
OrgAbuseEmail:  abuse@att.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ATTAB-ARIN

OrgTechHandle: IPSWI-ARIN
OrgTechName:   IP SWIP
OrgTechPhone:  +1-888-613-6330 
OrgTechEmail:  swipid@icorefep1.ims.att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/IPSWI-ARIN

OrgTechHandle: ZS44-ARIN
OrgTechName:   IPAdmin-ATT Internet Services
OrgTechPhone:  +1-888-510-5545 
OrgTechEmail:  ipadmin@att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ZS44-ARIN

OrgRoutingHandle: ROUTI59-ARIN
OrgRoutingName:   Routing POC
OrgRoutingPhone:  +1-999-999-9999 
OrgRoutingEmail:  routing@cbbtier3.att.net
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI59-ARIN

RTechHandle: IAA17-ARIN
RTechName:   IP Address Administration
RTechPhone:  +1-732-420-2071 
RTechEmail:  addrmgt@qsun.att.com
RTechRef:    https://rdap.arin.net/registry/entity/IAA17-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 1997-2024, American Registry for Internet Numbers, Ltd.
#

Search for
IP address lookups			Miscellaneous queries
-l	1st level less specific		-i	Inverse attributes	None admin-c admin-c,tech-c,zone-c author cross-mnt cross-nfy local-as mbrs-by-ref member-of mnt-by mnt-lower mnt-nfy mnt-routes notify nserver origin person referral-by rev-srv sub-dom tech-c upd-to zone-c
-L	All less specific		-T	Object types	All as-block as-set aut-num domain filter-set inet-rtr inet6num inetnum irt key-cert mntner peering-set person role route route-set rtr-set
-m	1st level more specific
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-d	Associated reverse domain