No hay exactamente una tabla para eso, y menos una precisa sobre ellos. La manera segura es hacerle un online whois a las IPs que te llegan y ver de donde vienen, o hacerle un query de whois y sacar el "owner" a todos los rangos de direcciones para CR.
63.250.133.160 - 63.250.133.191
64.34.60.8 - 64.34.60.15
64.34.108.0 - 64.34.108.127
64.59.80.144 - 64.59.80.159
64.69.65.192 - 64.69.65.223
64.86.216.0 - 64.86.223.255
65.17.198.70 - 65.17.198.79
65.17.213.128 - 65.17.213.159
65.17.241.150 - 65.17.241.159
65.17.241.210 - 65.17.241.219
65.175.93.208 - 65.175.93.223
65.182.11.0 - 65.182.30.255
65.247.135.0 - 65.247.135.255
66.165.163.40 - 66.165.163.47
66.175.125.8 - 66.175.125.15
66.212.224.32 - 66.212.224.39
66.212.225.16 - 66.212.225.31
66.212.226.224 - 66.212.226.255
66.212.228.96 - 66.212.228.127
66.212.233.208 - 66.212.233.215
66.212.235.0 - 66.212.235.31
66.212.238.224 - 66.212.238.231
66.212.244.32 - 66.212.244.39
66.212.244.128 - 66.212.244.255
66.212.251.48 - 66.212.251.55
67.211.102.0 - 67.211.102.127
69.13.129.128 - 69.13.129.136
72.51.24.0 - 72.51.24.127
76.12.184.128 - 76.12.184.143
76.74.148.64 - 76.74.148.79
76.74.148.112 - 76.74.148.127
85.25.231.128 - 85.25.231.159
91.213.126.0 - 91.213.126.255
163.178.0.0 - 163.178.255.255
186.4.0.0 - 186.4.63.255
186.15.0.0 - 186.15.255.255
190.7.160.0 - 190.7.175.255
190.7.192.0 - 190.7.223.255
190.10.0.0 - 190.10.127.255
190.102.32.0 - 190.102.47.255
190.106.64.0 - 190.106.79.255
190.123.128.0 - 190.123.143.255
190.124.244.0 - 190.124.247.255
190.241.0.0 - 190.241.43.255
190.241.45.0 - 190.241.45.255
190.241.47.128 - 190.241.255.255
192.153.167.0 - 192.153.167.255
193.33.71.64 - 193.33.71.95
194.108.39.176 - 194.108.39.179
194.212.118.56 - 194.212.118.63
194.212.213.224 - 194.212.213.235
194.228.112.16 - 194.228.112.31
196.40.0.0 - 196.40.95.255
200.0.179.0 - 200.0.179.255
200.9.32.0 - 200.9.63.255
200.9.209.0 - 200.9.209.255
200.12.167.0 - 200.12.167.255
200.12.238.0 - 200.12.239.255
200.24.136.0 - 200.24.136.15
200.50.224.0 - 200.50.231.255
200.59.16.0 - 200.59.23.255
200.74.248.0 - 200.74.255.255
200.91.64.0 - 200.91.191.255
200.105.96.0 - 200.105.103.255
200.107.82.0 - 200.107.83.255
200.122.128.0 - 200.122.191.255
201.191.0.0 - 201.207.255.255
201.237.0.0 - 201.237.255.255
202.133.248.128 - 202.133.248.143
202.133.248.176 - 202.133.248.191
202.133.249.128 - 202.133.249.143
202.133.249.176 - 202.133.249.191
202.153.198.160 - 202.153.198.175
202.153.202.80 - 202.153.202.95
202.153.205.240 - 202.153.205.255
205.211.208.0 - 205.211.217.255
205.211.229.0 - 205.211.232.255
205.211.236.0 - 205.211.241.255
208.133.200.0 - 208.133.203.255
208.133.206.0 - 208.133.206.255
208.165.48.0 - 208.165.63.255
208.206.176.0 - 208.206.177.255
209.51.208.16 - 209.51.208.23
209.200.133.192 - 209.200.133.199
209.200.135.80 - 209.200.135.87
209.200.135.144 - 209.200.135.159
209.200.168.0 - 209.200.168.15
209.200.168.40 - 209.200.168.47
209.200.168.96 - 209.200.168.111
216.15.236.160 - 216.15.236.175
216.38.48.10 - 216.38.48.13
216.40.96.152 - 216.40.96.159
216.40.102.224 - 216.40.102.255
216.72.225.0 - 216.72.225.255
216.194.165.0 - 216.194.165.127
217.114.218.32 - 217.114.218.39
