When I ran the dig command, this is what I get in return:
; <<>> DiG 9.10.3-P4-Raspbian <<>> -x 192.168.0.170
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22199
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;170.0.168.192.in-addr.arpa. IN PTR
;; ANSWER SECTION:
170.0.168.192.in-addr.arpa. 2 IN PTR crystal.
;; Query time: 18 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Dec 04 00:41:52 GMT 2018
;; MSG SIZE rcvd: 76
And, I restarted the pihole-FTL service. This is from the log below:
[2018-12-04 00:44:31.482] ########## FTL started! ##########
[2018-12-04 00:44:31.483] FTL branch:
[2018-12-04 00:44:31.483] FTL version: v4.0
[2018-12-04 00:44:31.483] FTL commit: 8493df4
[2018-12-04 00:44:31.483] FTL date: 2018-08-05 13:40:30 -0700
[2018-12-04 00:44:31.483] FTL user: pihole
[2018-12-04 00:44:31.483] Starting config file parsing (/etc/pihole/pihole-FTL.conf)
[2018-12-04 00:44:31.483] SOCKET_LISTENING: only local
[2018-12-04 00:44:31.483] AAAA_QUERY_ANALYSIS: Show AAAA queries
[2018-12-04 00:44:31.483] MAXDBDAYS: max age for stored queries is 365 days
[2018-12-04 00:44:31.483] RESOLVE_IPV6: Resolve IPv6 addresses
[2018-12-04 00:44:31.483] RESOLVE_IPV4: Resolve IPv4 addresses
[2018-12-04 00:44:31.483] DBINTERVAL: saving to DB file every minute
[2018-12-04 00:44:31.483] DBFILE: Using /etc/pihole/pihole-FTL.db
[2018-12-04 00:44:31.483] MAXLOGAGE: Importing up to 24.0 hours of log data
[2018-12-04 00:44:31.483] PRIVACYLEVEL: Set to 0
[2018-12-04 00:44:31.483] IGNORE_LOCALHOST: Show queries from localhost
[2018-12-04 00:44:31.483] BLOCKINGMODE: Null IPs for blocked domains
[2018-12-04 00:44:31.483] REGEX_DEBUGMODE: Inactive
[2018-12-04 00:44:31.483] Finished config file parsing
[2018-12-04 00:44:31.484] INFO: No whitelist file found
[2018-12-04 00:44:31.484] Compiled 0 Regex filters and -1 whitelisted domains in 0.1 msec (0 errors)
[2018-12-04 00:44:31.485] Database successfully initialized
[2018-12-04 00:44:31.485] Notice: Increasing queries struct size from 0 to 10000
[2018-12-04 00:44:31.485] Notice: Increasing domains struct size from 0 to 1000
[2018-12-04 00:44:31.485] Notice: Increasing clients struct size from 0 to 10
[2018-12-04 00:44:31.485] Notice: Increasing overTime struct size from 0 to 100
[2018-12-04 00:44:31.485] New forward server: 8.8.4.4 (0/0)
[2018-12-04 00:44:31.485] Notice: Increasing forwarded struct size from 0 to 4
[2018-12-04 00:44:31.489] New forward server: 8.8.8.8 (1/4)
[2018-12-04 00:44:31.493] Notice: Increasing clients struct size from 10 to 20
[2018-12-04 00:44:31.537] Notice: Increasing queries struct size from 10000 to 20000
[2018-12-04 00:44:31.603] Notice: Increasing queries struct size from 20000 to 30000
[2018-12-04 00:44:31.613] Notice: Increasing domains struct size from 1000 to 2000
[2018-12-04 00:44:31.676] Notice: Increasing queries struct size from 30000 to 40000
[2018-12-04 00:44:31.742] Notice: Increasing queries struct size from 40000 to 50000
[2018-12-04 00:44:31.805] Notice: Increasing queries struct size from 50000 to 60000
[2018-12-04 00:44:31.867] Notice: Increasing queries struct size from 60000 to 70000
[2018-12-04 00:44:31.879] Notice: Increasing clients struct size from 20 to 30
[2018-12-04 00:44:31.931] Notice: Increasing queries struct size from 70000 to 80000
[2018-12-04 00:44:31.992] Notice: Increasing queries struct size from 80000 to 90000
[2018-12-04 00:44:32.057] Notice: Increasing queries struct size from 90000 to 100000
[2018-12-04 00:44:32.119] Notice: Increasing queries struct size from 100000 to 110000
[2018-12-04 00:44:32.183] Notice: Increasing queries struct size from 110000 to 120000
[2018-12-04 00:44:32.247] Notice: Increasing queries struct size from 120000 to 130000
[2018-12-04 00:44:32.304] Notice: Increasing queries struct size from 130000 to 140000
[2018-12-04 00:44:32.359] Notice: Increasing queries struct size from 140000 to 150000
[2018-12-04 00:44:32.416] Notice: Increasing queries struct size from 150000 to 160000
[2018-12-04 00:44:32.468] Notice: Increasing overTime struct size from 100 to 200
[2018-12-04 00:44:32.473] Notice: Increasing queries struct size from 160000 to 170000
[2018-12-04 00:44:32.537] Notice: Increasing queries struct size from 170000 to 180000
[2018-12-04 00:44:32.594] Notice: Increasing queries struct size from 180000 to 190000
[2018-12-04 00:44:32.652] Notice: Increasing queries struct size from 190000 to 200000
[2018-12-04 00:44:32.709] Notice: Increasing queries struct size from 200000 to 210000
[2018-12-04 00:44:32.767] Notice: Increasing queries struct size from 210000 to 220000
[2018-12-04 00:44:32.826] Notice: Increasing queries struct size from 220000 to 230000
[2018-12-04 00:44:32.915] Notice: Increasing queries struct size from 230000 to 240000
[2018-12-04 00:44:32.998] Imported 235188 queries from the long-term database
[2018-12-04 00:44:32.999] -> Total DNS queries: 235188
[2018-12-04 00:44:32.999] -> Cached DNS queries: 209644
[2018-12-04 00:44:32.999] -> Forwarded DNS queries: 20813
[2018-12-04 00:44:32.999] -> Exactly blocked DNS queries: 4731
[2018-12-04 00:44:32.999] -> Unknown DNS queries: 0
[2018-12-04 00:44:32.999] -> Unique domains: 1955
[2018-12-04 00:44:32.999] -> Unique clients: 23
[2018-12-04 00:44:32.999] -> Known forward destinations: 2
[2018-12-04 00:44:32.999] Successfully accessed setupVars.conf
[2018-12-04 00:44:33.006] PID of FTL process: 7340
[2018-12-04 00:44:33.007] Listening on port 4711 for incoming IPv4 telnet connections
[2018-12-04 00:44:33.007] Listening on port 4711 for incoming IPv6 telnet connections
[2018-12-04 00:44:33.007] Listening on Unix socket
[2018-12-04 00:44:33.008] FATAL: Trying to free NULL pointer in free_whitelist_domains() (regex.c:72)
[2018-12-04 00:44:33.008] INFO: No whitelist file found
[2018-12-04 00:44:33.008] Compiled 0 Regex filters and -1 whitelisted domains in 0.1 msec (0 errors)
[2018-12-04 00:44:33.832] /etc/pihole/gravity.list: parsed 137669 domains (took 823.6 ms)