% 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:       129.255.0.0 - 129.255.255.255
CIDR:           129.255.0.0/16
NetName:        UIOWA-5
NetHandle:      NET-129-255-0-0-1
Parent:         NET129 (NET-129-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   University of Iowa (UNIVER-294)
RegDate:        1994-07-25
Updated:        2025-06-02
Ref:            https://rdap.arin.net/registry/ip/129.255.0.0

OrgName:        University of Iowa
OrgId:          UNIVER-294
Address:        Information Technology Services
Address:        5 LC
City:           Iowa City
StateProv:      IA
PostalCode:     52242
Country:        US
RegDate:        1987-06-05
Updated:        2024-07-31
Ref:            https://rdap.arin.net/registry/entity/UNIVER-294

OrgNOCHandle: NOC1452-ARIN
OrgNOCName:   Network Operations Center
OrgNOCPhone:  +1-319-335-6449 
OrgNOCEmail:  noc@uiowa.edu
OrgNOCRef:    https://rdap.arin.net/registry/entity/NOC1452-ARIN

OrgTechHandle: SOPPE-ARIN
OrgTechName:   Soppe, Scott 
OrgTechPhone:  +1-319-384-2202 
OrgTechEmail:  scott-soppe@uiowa.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/SOPPE-ARIN

OrgTechHandle: TIMPE9-ARIN
OrgTechName:   Timperley, Trevor 
OrgTechPhone:  +1-319-467-0372 
OrgTechEmail:  trevor-timperley@uiowa.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/TIMPE9-ARIN

OrgAbuseHandle: NETWO442-ARIN
OrgAbuseName:   network abuse
OrgAbusePhone:  +1-319-384-0800 
OrgAbuseEmail:  abuse@uiowa.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO442-ARIN

OrgTechHandle: HOSTM404-ARIN
OrgTechName:   hostmaster
OrgTechPhone:  +1-319-335-6159 
OrgTechEmail:  hostmaster@uiowa.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/HOSTM404-ARIN

OrgTechHandle: MILLS405-ARIN
OrgTechName:   Millson, Andrew 
OrgTechPhone:  +1-319-335-6159 
OrgTechEmail:  andrew-millson@uiowa.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/MILLS405-ARIN

RTechHandle: SOPPE-ARIN
RTechName:   Soppe, Scott 
RTechPhone:  +1-319-384-2202 
RTechEmail:  scott-soppe@uiowa.edu
RTechRef:    https://rdap.arin.net/registry/entity/SOPPE-ARIN

RNOCHandle: NOC1452-ARIN
RNOCName:   Network Operations Center
RNOCPhone:  +1-319-335-6449 
RNOCEmail:  noc@uiowa.edu
RNOCRef:    https://rdap.arin.net/registry/entity/NOC1452-ARIN

RAbuseHandle: NETWO442-ARIN
RAbuseName:   network abuse
RAbusePhone:  +1-319-384-0800 
RAbuseEmail:  abuse@uiowa.edu
RAbuseRef:    https://rdap.arin.net/registry/entity/NETWO442-ARIN

RTechHandle: TIMPE9-ARIN
RTechName:   Timperley, Trevor 
RTechPhone:  +1-319-467-0372 
RTechEmail:  trevor-timperley@uiowa.edu
RTechRef:    https://rdap.arin.net/registry/entity/TIMPE9-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.
#