alta vista 24 hr update spider?

[chompy]

I recently noticed my site is refreshed every 24hrs on Altavista and the following spiders are on my site. Is there a particular id for the 24hr refresh as opposed to the 48 hr refresh spider?

216.39.51.5 mmbuild4.sv.av.com (is this the 24 hr update spider?)
216.39.50.143 drone3.sv.av.com
216.39.50.145 drone5.sv.av.com
216.39.50.116 drone2.sv.av.com 216.39.50.155 drone6.sv.av.com

216.39.50.0 Seneca01 (ON,CA)

hope thats enough info?

[heini]

I see drone2 and drone5 refreshing some pages in a site on a daily basis.