What does srccountry="Reserved" mean?

[Sharma_Harsh]

Firewall Logs from FG-800c 
Here is a sample from the log: almost 20% logs have either srccountry='Reserved' or dstcountry='Reserved'
'2018-03-31T03:49:00.493663+05:30 * date=2018-03-31 time=03:49:00 devname=FG800C3G11614133 devid=FG800C3913802529 logid=0000000013 type=traffic subtype=forward level=notice vd=root srcip=10.208.23.164 srcname=RedmiNote4-Redmi srcport=63956 srcintf="port3" dstip=96.45.33.73 dstport=8888 dstintf="wan1" sessionid=2579982575 status=deny policyid=0 dstcountry="United States" srccountry="Reserved" trandisp=noop service=8888/udp proto=17 duration=0 sentbyte=0 rcvdbyte=0 devtype="Windows PC" osname="Windows" osversion="7" unauthuser=* unauthusersource="imap" mastersrcmac=00:15:17:76:54:29 srcmac=00:15:17:76:54:29 crscore=2432696350 craction=131072'

[Lukino]

I think it means that the source address is a private IP

[Kenundrum]

Yes- it is referring to RFC1918 and other private use IP addresses not assigned to the public internet.

[emnoc]

yes reserved and never to be use outside of that here's some more geoip  tips

http://socpuppet.blogspot.com/2017/08/fortios-geoip-tips.html