Re: [PERFORM] Filter certain range of IP address. - Mailing list pgsql-performance

On Fri, Apr 7, 2017 at 11:29 AM, David G. Johnston <david.g.johnston@gmail.com> wrote:

On Fri, Apr 7, 2017 at 8:18 AM, Dinesh Chandra 12108 <Dinesh.Chandra@cyient.com> wrote:

Dear Vinny,

Thanks for your valuable replay.

but I need a select query, which select only that record which starts from IP "172.23.110" only from below table.

xxx     172.23.110.175
yyy     172.23.110.178
zzz     172.23.110.177
aaa     172.23.110.176
bbb     172.23.111.180
ccc     172.23.115.26

​SELECT ... WHERE substring(ip_addr::text, 1, 10) = '172.23.110'

or

   select ... where ip_addr << '172.23.110/32';

/32 is for one address only (fourth byte, which we want to exclude), so we need to use /24 (as for CIDR notation), that would be equal to a 255.255.255.0 subnet mask.

My 2 cents
Moreno