Not so sure about that… 240.59.103.76.in-addr.arpa. 7200 IN PTR c-76-103-59-240.hsd1.ca.comcast.net.
is most definitely a business class service from Comcast. Seems to match the entry for 24.7.48.153 pretty closely. I think the difference is the type of cable network in the particular area. HFC is Hybrid Fiber Coax. The network in San Jose doesn’t really have any fiber, so it’s likely not an HFC network. I’m not sure what HSD stands for other than possibly “High Speed Data”, but I suspect it’s more likely some cable-specific term for an all-copper alternative to HFC. Owen > On Mar 2, 2015, at 03:39 , Rich Kulawiec <r...@gsp.org> wrote: > > On Sun, Mar 01, 2015 at 11:58:34AM -0500, Christopher Morrow wrote: >> business vs consumer edition products? (that'd be my bet) > > I think these are all residential customers, as business customers > appear to use different subdomains and/or host naming conventions, e.g.: > > 24.7.48.153 c-24-7-48-153.hsd1.ca.comcast.net > 24.10.217.142 c-24-10-217-142.hsd1.ut.comcast.net > 24.129.85.220 c-24-129-85-220.hsd1.fl.comcast.net > vs. > 70.88.25.201 70-88-25-201-chesterfield-va.hfc.comcastbusiness.net > 70.90.158.37 70-90-158-37-knoxville.hfc.comcastbusiness.net > 70.91.133.105 70-91-133-105-ma-ne.hfc.comcastbusiness.net > > Or: > 23.240.176.98 cpe-23-240-176-98.socal.res.rr.com > 24.25.253.81 cpe-24-25-253-81.hawaii.res.rr.com > 24.27.121.156 cpe-24-27-121-156.tx.res.rr.com > vs. > 24.106.98.106 rrcs-24-106-98-106.central.biz.rr.com > 24.142.142.169 rrcs-24-142-142-169.central.biz.rr.com > 24.173.100.134 rrcs-24-173-100-134.sw.biz.rr.com > > Those are all (very recent) direct-to-MX on port 25 spam sources, but it > looks to me like the first group in each set is residential and the second > group is business. But perhaps I'm misinterpreting the naming. > > ---rsk
