A customer of mine owns a cidr block they haven't been using. They've asked me to advertise it. I note that this block is being advertised by an ALTERNET customer. The nic / radb agree with my customer: HEARTS:[GAVRON.INTERNET]_whois 204.193.128.0 B3 Corporation (NETBLK-B3NET-EC) 2521 W. Arnold St. Marshfield, WI 54449 Netname: B3NET-EC Netblock: 204.193.128.0 - 204.193.159.0 Note that the ``unscrupulous other isp'' has gotten inverse: Domain System inverse mapping provided by: NS.CYBERCONNECTION.COM 204.193.128.253 RADB says: route: 204.193.128.0/19 descr: US Cyber (sm) descr: 2451 W Arnold Street descr: Marshfield descr: WI 54449, USA origin: AS4136 comm-list: COMM_NSFNET advisory: AS690 1:4136 mnt-by: MAINT-AS4136 changed: nsfnet-admin@merit.edu 950505 source: RADB But the route is being annouced by ``cyberconnection'' out of AS701. Ideas? Should I just advertise this and to hell with the backbones? Alternet? Ehud