Is Modem DNS Name Per IP or Per Account?

[lordy]

Is the DNS name for an NTL cable connection tied to the IP address or
a specific custoner account ?

cpc2-lewi5-0-0-cust<nnn>.bmly.cable.ntl.com

It looks like customer but you never know!

If it is tied to the customer that would allow me to easily track when my IP is changed & update the DNS for my personal domain. (Until I find ISP with fixed IP).

Might even be able to point my MX record right at it??

Lordy

[Paul]

It is the reverse dns of the IP address, not related to any account.

[lordy]

Thanks, I know its the reverse lookup of the IP, but I was hoping the IP and the reverse lookup was updated when DHCP doles out the IP address to a particular modem (ie DHCP updates DNS) , rather than NTL using a static list (which admittedly is what most IPs do!)

Eg from grc.com (not my favourite site but it may help to hear what I'm asking for in different words!)

"The string of text above is known as your Internet connection's "reverse DNS." The end of the string is probably a domain name related to your ISP. This will be common to all customers of this ISP. But the beginning of the string uniquely identifies your Internet connection. The question is: Is the beginning of the string an "account ID" that is uniquely and permanently tied to you, or is it merely related to your current public IP address and thus subject to change?"

Most fixed revers lookups that I've seen, contain the IP adress backwards ie 231_43_45_87-ntl-bromley.blah.net

Looks like NTL have gone for an 'unconventional' approach, if its permanently tied to the IP :)

Just odd that it contains 'cust<nnn>' ??

Just tried nslookup on a few cust<nnn> in sequence, and the IP did indeed go up in sequence, so I'll be quiet now!! I could have tried that before asking!!!

Thanks again!

[mmm]

Is the DNS name for an NTL cable connection tied to the IP address or
a specific custoner account ?

cpc2-lewi5-0-0-cust<nnn>.bmly.cable.ntl.com

It looks like customer but you never know!

If it is tied to the customer that would allow me to easily track when my IP is changed & update the DNS for my personal domain. (Until I find ISP with fixed IP).

Might even be able to point my MX record right at it??

Lordy

whats wrong with dynamic IP services such as dyndns.com which offer services ffrom 0.00.

My Linksys router supports this and allow s me to ping / tracert my connection remotely even if the IP changes (and there are plently of PC clients etc)

[lordy]

Yup. I'm gonna try one of those soon Any obvious differences bet dydns and no-ip.com?

[mmm]

Yup. I'm gonna try one of those soon Any obvious differences bet dydns and no-ip.com?

My router doesn't support no-ip! Only problem I have with dyndns.com is that my ntl IP rarely changes and the router update at least every 25 days doesn't work, and dyndns delete the free account if you don't update once a month . I have a windows script I used to use for dyndns (before I had a router that supported it) which I used to run once a day, but can't use both as unnecessary updates are regarded as 'abusive' too may of these and your account gets blocked!