blocking 117.0.0.0/8 shows as having blocked localhost

Question

I'm trying to block some foreign ip traffic to our webserver. Arin.net shows that the block 117.0.0.0/8 belongs to South Brisbane Australia. But when I block it, it shows up as "localhost/8".

$ sudo iptables -I INPUT -s 117.0.0.0/8 -j DROP -m comment --comment "south brisbane au"

the result from the listing of iptables -L --line-numbers is:

Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination
1    DROP       all  --  localhost/8          anywhere             /* south brisbane au */

What's going on here? Why is 117.0.0.0/8 showing up as "localhost/8"? Will this block affect any traffic to localhost?

UPDATE (and output of accepted solution)

I implemented using -n as suggested by several including the accepted answer. Here is the output after using -n:

$ sudo iptables -L -n --line-numbers | head
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination
1    DROP       all  --  117.0.0.0/8          0.0.0.0/0            /* south brisbane au */

---

An added benefit is that, iptables -L had gotten tremendously slow. I had not had time to look into it; but avoiding the dns lookups also solved that problem. Obviously, the dns lookups on the source were making iptables -L very very slow with more than a handful in the chain. It now emits the complete 144 in that chain immediately. It seems odd that reverse lookup for the source is the default.

Answer 1

It's a false alarm caused by

% host 117.0.0.0
0.0.0.117.in-addr.arpa domain name pointer localhost.

the owner of the relevant reverse DNS zone putting a "localhost." record on that address. There's a flag to iptables to turn off DNS lookups (-n). This will also make the command run faster as no time is wasted on said lookups.

If you need the owner of that zone use dig as that will show the SOA. You'll need to use the reverse address form (which host or other lookup tools will return):

% dig 0.0.0.117.in-addr.arpa
...
;; AUTHORITY SECTION:
0.117.in-addr.arpa.     86266   IN      SOA     dns1.vietel.com.vn. tuananh.viettel.com.vn. 2008010803 10800 3600 604800 86400