This table is the list of the RFC 1918 & 6598 non-routable addresses on the Internet

Class Start End Mask CIDR CIDR Mask CIDR Wildcard
A 10.0.0.0 10.255.255.255 255.0.0.0 10.0.0.0/8 255.0.0.0 0.255.255.255
100.64.0.0 100.127.255.255 255.192.0.0 100.64.0.0/10 255.192.0.0 0.63.255.255
B 172.16.0.0 172.31.255.255 255.240.0.0 172.16.0.0/12 255.240.0.0 0.15.255.255
C 192.168.0.0 192.168.255.0 255.255.255.0 192.168.0.0/16 255.255.0.0 0.0.255.255
Some other special address ranges
Windows autoconfiguration (for when the DHCP server is down)
B 169.254.0.0 169.254.255.255 255.255.0.0 169.254.0.0/16 255.255.0.0 0.0.255.255

Some extra info about various CIDR blocks

This is from https://datatracker.ietf.org/doc/rfc5735/
4.  Summary Table

Address Block       Present Use                Reference
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0.0.0.0/8           "This" Network             RFC 1122, Section 3.2.1.3
10.0.0.0/8          Private-Use Networks       RFC 1918
100.64.0.0/10       Shared addresses           RFC 6598
127.0.0.0/8         Loopback                   RFC 1122, Section 3.2.1.3
169.254.0.0/16      Link Local                 RFC 3927
172.16.0.0/12       Private-Use Networks       RFC 1918
192.0.0.0/24        IETF Protocol Assignments  RFC 5736
192.0.2.0/24        TEST-NET-1                 RFC 5737
192.88.99.0/24      6to4 Relay Anycast         RFC 3068
192.168.0.0/16      Private-Use Networks       RFC 1918
198.18.0.0/15       Network Interconnect
                    Device Benchmark Testing   RFC 2544
198.51.100.0/24     TEST-NET-2                 RFC 5737
203.0.113.0/24      TEST-NET-3                 RFC 5737
224.0.0.0/4         Multicast                  RFC 3171
240.0.0.0/4         Reserved for Future Use    RFC 1112, Section 4
255.255.255.255/32  Limited Broadcast          RFC 919, Section 7
                                               RFC 922, Section 7