Hi, we do whois -h whois.ripe.net -r -m <our Allocation/16> | grep inetnum | sed "s/inetnum: //" | sed "s/ - /./" > <some file> for our Allocations once a month and analyse this with awk script #!/usr/bin/sh nawk -F. 'BEGIN{summe=0} NF==8 { for(i=1; i<=NF; i++) byte[i]=$i; if(byte[3]!=byte[7]) { size=(byte[7]-byte[3])*256; if(byte[4]>byte[8]) size-=byte[8]-byte[4]; else size+=byte[8]+byte[4]; size++; } else { size=byte[8]-byte[4]+1; } summe+=size; printf("%s: %d IPs\n", $0, size); } END{printf("Summe %ld\n", summe);}' < <some file> so we could calculate the #IPs, check overlappings, check our own IP-DB against it ... and so on. We hope that this querys do not bother the RIPE-DB ;-) Kind Regards, _____________________________ Stephan Mankopf +49 5241 80 88729 stephan.mankopf@mediaways.net