/usr/share/freeradius/dictionary.nomadix 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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | # -*- text -*-
#
# Version:	$Id$
#
VENDOR		Nomadix				3309
#
BEGIN-VENDOR	Nomadix
ATTRIBUTE	Nomadix-Bw-Up				1	integer
ATTRIBUTE	Nomadix-Bw-Down				2	integer
ATTRIBUTE	Nomadix-URL-Redirection			3	string
ATTRIBUTE	Nomadix-IP-Upsell			4	integer
ATTRIBUTE	Nomadix-Expiration			5	string
ATTRIBUTE	Nomadix-Subnet				6	string
ATTRIBUTE	Nomadix-MaxBytesUp			7	integer
ATTRIBUTE	Nomadix-MaxBytesDown			8	integer
ATTRIBUTE	Nomadix-EndofSession			9	integer
ATTRIBUTE	Nomadix-Logoff-URL			10	string
ATTRIBUTE	Nomadix-Net-VLAN			11	integer
ATTRIBUTE	Nomadix-Config-URL			12	string
ATTRIBUTE	Nomadix-Goodbye-URL			13	string
VALUE	Nomadix-IP-Upsell		PrivatePool		0
VALUE	Nomadix-IP-Upsell		PublicPool		1
END-VENDOR	Nomadix
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