This is official link to config file with the latest nodes, just place the file in your Radium folder and restart the client:
https://radiumcore.org/radium.conf

You can also find the node list on:
https://chainz.cryptoid.info/rads/#!network

addnode=1.52.218.162
addnode=100.4.218.251
addnode=103.129.189.80
addnode=103.129.189.82
addnode=104.200.132.168
addnode=108.77.80.39
addnode=109.184.73.20
addnode=109.206.213.143
addnode=109.88.194.34
addnode=109.89.234.67
addnode=115.87.138.6
addnode=12.25.150.130
addnode=128.71.254.156
addnode=13.209.44.12
addnode=134.101.248.222
addnode=134.19.189.6
addnode=134.19.189.68
addnode=14.38.170.125
addnode=141.135.199.152
addnode=142.44.212.178
addnode=146.185.165.6
addnode=149.22.21.28
addnode=158.58.172.55
addnode=159.89.135.13
addnode=173.139.6.209
addnode=173.231.116.93
addnode=173.246.192.64
addnode=174.6.65.32
addnode=176.109.155.245
addnode=176.116.142.41
addnode=176.118.48.189
addnode=176.214.77.75
addnode=178.120.47.142
addnode=178.151.171.117
addnode=178.194.39.165
addnode=178.94.61.185
addnode=18.221.42.185
addnode=18.237.146.241
addnode=181.39.124.227
addnode=184.180.105.217
addnode=188.138.9.217
addnode=188.187.188.52
addnode=188.42.33.124
addnode=191.163.22.176
addnode=193.138.52.203
addnode=193.198.102.23
addnode=193.30.123.202
addnode=194.96.160.145
addnode=197.229.254.44
addnode=198.46.110.198
addnode=198.53.136.86
addnode=199.247.30.107
addnode=2.152.114.104
addnode=2.82.239.33
addnode=2.92.251.126
addnode=2.95.174.253
addnode=200.82.130.80
addnode=203.213.115.28
addnode=213.233.216.158
addnode=24.217.226.202
addnode=24.52.230.202
addnode=3.121.247.139
addnode=31.185.5.4
addnode=34.215.4.172
addnode=34.224.84.131
addnode=35.238.187.153
addnode=35.246.248.126
addnode=40.118.232.138
addnode=41.113.48.56
addnode=41.113.74.97
addnode=41.193.193.228
addnode=45.32.215.202
addnode=45.32.239.169
addnode=45.76.85.113
addnode=46.132.71.57
addnode=46.219.222.89
addnode=46.4.122.26
addnode=47.157.17.46
addnode=5.189.183.89
addnode=5.28.84.129
addnode=5.9.123.69
addnode=51.254.96.237
addnode=54.187.244.119
addnode=58.174.6.207
addnode=61.216.156.81
addnode=68.0.156.105
addnode=68.196.244.12
addnode=68.224.6.69
addnode=68.80.205.182
addnode=69.254.109.254
addnode=70.45.226.3
addnode=70.54.130.104
addnode=72.238.25.115
addnode=72.39.37.164
addnode=73.121.247.82
addnode=73.125.135.103
addnode=73.166.147.189
addnode=74.39.212.226
addnode=75.164.187.125
addnode=76.169.61.114
addnode=77.165.155.127
addnode=78.150.39.24
addnode=78.56.242.6
addnode=80.108.64.53
addnode=80.110.82.38
addnode=80.43.176.118
addnode=81.0.245.114
addnode=81.221.136.174
addnode=81.221.71.29
addnode=81.237.232.122
addnode=82.154.43.35
addnode=82.161.243.167
addnode=82.45.62.128
addnode=83.213.82.42
addnode=83.240.61.52
addnode=83.28.9.49
addnode=84.166.158.147
addnode=84.226.174.106
addnode=84.26.17.150
addnode=85.19.25.38
addnode=86.6.94.20
addnode=87.208.61.60
addnode=88.180.239.134
addnode=89.187.168.90
addnode=89.242.221.119
addnode=89.39.107.190
addnode=90.240.77.64
addnode=90.241.168.241
addnode=90.254.115.67
addnode=90.254.122.170
addnode=90.255.108.216
addnode=91.114.133.201
addnode=91.246.67.33
addnode=91.86.245.100
addnode=92.34.241.190
addnode=94.179.21.110
addnode=94.224.99.25
addnode=94.25.169.192
addnode=94.25.170.210
addnode=94.3.99.34
addnode=94.65.73.9
addnode=94.71.90.235
addnode=95.129.58.28
addnode=95.216.23.230
addnode=95.217.77.209
addnode=95.32.130.130
addnode=95.34.208.95
addnode=95.82.135.148
addnode=96.41.65.224
addnode=98.116.65.219
addnode=99.129.133.137