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Ubuntu - Networking - ARP - Where are ARP entries stored in the system?

Access it from /proc file system.

cat /proc/net/arp

Result

IP address       HW type     Flags       HW address            Mask     Device
10.12.2.40       0x1         0x2         12:f7:fd:48:aa:79     *        eth0
10.12.2.43       0x1         0x2         12:48:08:aa:a5:bb     *        eth0
10.12.2.8        0x1         0x2         12:ab:ed:67:34:79     *        eth0
10.12.2.94       0x1         0x2         12:47:87:c2:60:8d     *        eth0
10.12.2.1        0x1         0x2         12:6f:56:c0:c4:c1     *        eth0