<![CDATA[APNIC doesn't give CIDR format? doh]]>So I've been busily firewalling off entire networks found to be remotely probing RDP, SSH, Radmin, SQL, etc that I see appearing in the logs, mainly just to drop them so I can see other more important things that may be blocked in the logs.

Unfortunately some of the big global registries don't report ranges in CIDR format.

http://www.apnic.net/

Whois Search: 183.60.159.20

The range is "183.0.0.0 - 183.63.255.255"

What CIDR is that, and how do I figure that out?

Is there an easy calculator somewhere where I can just drop in the start and end addresses, and it spits out the netmask?

.

]]>https://forum.netgate.com/topic/54565/apnic-doesn-t-give-cidr-format-dohRSS for NodeWed, 11 Mar 2026 12:36:09 GMTMon, 25 Mar 2013 18:07:53 GMT60<![CDATA[Reply to APNIC doesn't give CIDR format? doh on Wed, 27 Mar 2013 20:13:04 GMT]]>You can enter an IP range into the alias field for a network alias and it will calculate the appropriate CIDR format address.

]]>https://forum.netgate.com/post/386890https://forum.netgate.com/post/386890Wed, 27 Mar 2013 20:13:04 GMT<![CDATA[Reply to APNIC doesn't give CIDR format? doh on Mon, 25 Mar 2013 23:06:56 GMT]]>Country IP Blocks is what I use with pfBlocker:

IP Address assigned to: CHINA

IP Address: 183.60.159.20 is located within the following Network:

Network: 183.0.0.0
CIDR: 183.0.0.0/10
Mask: 183.0.0.0/255.192.0.0
Network Range: 183.0.0.0 - 183.63.255.255
Total addresses: 4,194,304

]]>https://forum.netgate.com/post/386464https://forum.netgate.com/post/386464Mon, 25 Mar 2013 23:06:56 GMT