Reverse zone records starting with "0" are not imported. E.g. 0.138.80.85.in-addr.arpa is not imported.

Example reverse zone file:

$TTL 3600
@ IN SOA ns1.cybercity.dk. zonec.cybercity.dk. (
1439555627 ; Serial
10800 ; Refresh
3600 ; Retry
604800 ; Expire
3600) ; Minimum
@ NS ns1.cybercity.dk.
@ NS ns2.cybercity.dk.
0 PTR 0x55508a00.adsl.cybercity.dk.
1 PTR 0x55508a01.adsl.cybercity.dk.
2 PTR 0x55508a02.adsl.cybercity.dk.
3 PTR 0x55508a03.adsl.cybercity.dk.

Starting import using: /home/pto/home/namedb/gen/test.conf
zone: 138.80.85.in-addr.arpa from gen/d6/P.138.80.85.in-addr.arpa_test
zid: 8752
NS : 138.80.85.in-addr.arpa ns1.cybercity.dk.
NS : 138.80.85.in-addr.arpa ns2.cybercity.dk.
NS : 138.80.85.in-addr.arpa ns3.cybercity.dk.
NS : 138.80.85.in-addr.arpa ns4.cybercity.dk.
PTR : 0.138.80.85.in-addr.arpa 0x55508a00.adsl.cybercity.dk
record exists
PTR : 1.138.80.85.in-addr.arpa 0x55508a01.adsl.cybercity.dk
0
1 PTR 0x55508a01.adsl.cybercity.dk.
record exists
PTR : 2.138.80.85.in-addr.arpa 0x55508a02.adsl.cybercity.dk
0
2 PTR 0x55508a02.adsl.cybercity.dk.
record exists
PTR : 3.138.80.85.in-addr.arpa 0x55508a03.adsl.cybercity.dk
0
3 PTR 0x55508a03.adsl.cybercity.dk.
record exists

SQL data from zone nt_zone_record:

773909 8752 1 3600 NULL 12 0x55508a01.adsl.cybercity.dk. NULL NULL NULL NULL NULL 0
774020 8752 2 3600 NULL 12 0x55508a02.adsl.cybercity.dk. NULL NULL NULL NULL NULL 0
774087 8752 3 3600 NULL 12 0x55508a03.adsl.cybercity.dk. NULL NULL NULL NULL NULL 0

The zone is not shown in nictool either.