% 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:       139.181.0.0 - 139.181.255.255
CIDR:           139.181.0.0/16
NetName:        SIEMENS-DISW-11
NetHandle:      NET-139-181-0-0-1
Parent:         NET139 (NET-139-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   Siemens Industry Software Inc. (SIS-377)
RegDate:        1990-03-26
Updated:        2022-11-16
Ref:            https://rdap.arin.net/registry/ip/139.181.0.0

OrgName:        Siemens Industry Software Inc.
OrgId:          SIS-377
Address:        8005 SW Boeckman Road
City:           Wilsonville
StateProv:      OR
PostalCode:     97070-7777
Country:        US
RegDate:        2022-05-10
Updated:        2026-03-12
Comment:        Formerly Mentor Graphics Corporation
Ref:            https://rdap.arin.net/registry/entity/SIS-377

OrgRoutingHandle: TUCKE477-ARIN
OrgRoutingName:   Tucker, Kenneth 
OrgRoutingPhone:  +353-61-531955 
OrgRoutingEmail:  ken.tucker@siemens.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/TUCKE477-ARIN

OrgAbuseHandle: SISA1-ARIN
OrgAbuseName:   Siemens Industry Software Inc Abuse
OrgAbusePhone:  +1-503-685-7000 
OrgAbuseEmail:  gne-arin-abuse.sisw@siemens.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SISA1-ARIN

OrgDNSHandle: SMALL199-ARIN
OrgDNSName:   Smalley, Jennifer 
OrgDNSPhone:  +1-515-509-2092 
OrgDNSEmail:  jennifer.smalley@siemens.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/SMALL199-ARIN

OrgNOCHandle: SMALL199-ARIN
OrgNOCName:   Smalley, Jennifer 
OrgNOCPhone:  +1-515-509-2092 
OrgNOCEmail:  jennifer.smalley@siemens.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/SMALL199-ARIN

OrgRoutingHandle: SMALL199-ARIN
OrgRoutingName:   Smalley, Jennifer 
OrgRoutingPhone:  +1-515-509-2092 
OrgRoutingEmail:  jennifer.smalley@siemens.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/SMALL199-ARIN

OrgTechHandle: SMALL199-ARIN
OrgTechName:   Smalley, Jennifer 
OrgTechPhone:  +1-515-509-2092 
OrgTechEmail:  jennifer.smalley@siemens.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SMALL199-ARIN

OrgTechHandle: TUCKE477-ARIN
OrgTechName:   Tucker, Kenneth 
OrgTechPhone:  +353-61-531955 
OrgTechEmail:  ken.tucker@siemens.com
OrgTechRef:    https://rdap.arin.net/registry/entity/TUCKE477-ARIN

OrgNOCHandle: TUCKE477-ARIN
OrgNOCName:   Tucker, Kenneth 
OrgNOCPhone:  +353-61-531955 
OrgNOCEmail:  ken.tucker@siemens.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/TUCKE477-ARIN

OrgDNSHandle: TUCKE477-ARIN
OrgDNSName:   Tucker, Kenneth 
OrgDNSPhone:  +353-61-531955 
OrgDNSEmail:  ken.tucker@siemens.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/TUCKE477-ARIN

OrgTechHandle: SIST-ARIN
OrgTechName:   Siemens Industry Software Inc Tech
OrgTechPhone:  +1-503-685-7000 
OrgTechEmail:  gne-arin-tech.sisw@siemens.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SIST-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.
#