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?

    .



  • 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


  • Rebel Alliance Developer Netgate

    You can enter an IP range into the alias field for a network alias and it will calculate the appropriate CIDR format address.


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