/usr/share/freeradius/dictionary.infonet is in freeradius-common 2.1.12+dfsg-1.2ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# dictionary.infonet
#
#		Accounting VSAs by
#		"Bernard Lhoas from Infonet" <Bernard_Lhoas@infonet.com>
#
# Version:	@(#)dictionary.infonet  1.00
#
VENDOR		infonet				4453
#
#	Standard attribute
#
# I would like to change the attribute number of Infonet-Account-Number
# but we are already using it in production and changing could get
# messy. Same with Infonet-Type.  -Clark
BEGIN-VENDOR	infonet
ATTRIBUTE	Infonet-Proxy				238	string
ATTRIBUTE	Infonet-Config				239	string
ATTRIBUTE	Infonet-MCS-Country			240	string
ATTRIBUTE	Infonet-MCS-Region			241	string
ATTRIBUTE	Infonet-MCS-Off-Peak			242	string
ATTRIBUTE	Infonet-MCS-Overflow			243	string
ATTRIBUTE	Infonet-MCS-Port			244	string
ATTRIBUTE	Infonet-MCS-Port-Count			245	string
ATTRIBUTE	Infonet-Account-Number			247	string
ATTRIBUTE	Infonet-Type				248	string
#
#       Infonet-Specific Attributes
#
# Note: Only Attributes < 256 will go on the wire. They are known as
#       "wire attributes".
#       Attributes > 256 don't get sent to a NAS and don't get forwarded
#       to a proxy site. This includes accounting packets as well as
#       auth packets.
#
ATTRIBUTE	Infonet-Pool-Request			252	string
ATTRIBUTE	Infonet-Surcharge-Type			254	integer
ATTRIBUTE	Infonet-NAS-Location			255	string
ATTRIBUTE	Infonet-Random-IP-Pool			246	string
#
ATTRIBUTE	Infonet-Realm-Type			249	string
ATTRIBUTE	Infonet-LoginHost-Dest			250	string
ATTRIBUTE	Infonet-Tunnel-Decision-IP		251	string
END-VENDOR	infonet
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