How to get the IP address of DNS Nameserver
When I do an nslookup on the net. zone, I get the following output:
nslookup -type=soa net 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
net
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1542217316
refresh = 1800
retry = 900
expire = 604800
minimum = 86400
Authoritative answers can be found from:
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net. However, the IP Address of a.gtld-servers.net is not given. This results in a catch-22, because in order to get the IP address of any subzone in the net. zone, one should query a.gtld-servers.net.
So my question is, how to get out of this catch-22? How can I get the IP address of a.gtld-servers.net without having to do another DNS request?
dns
asked Nov 14 '18 at 17:51
TomTom
5719
add a comment |
When I do an nslookup on the net. zone, I get the following output:
nslookup -type=soa net 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
net
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1542217316
refresh = 1800
retry = 900
expire = 604800
minimum = 86400
Authoritative answers can be found from:
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net. However, the IP Address of a.gtld-servers.net is not given. This results in a catch-22, because in order to get the IP address of any subzone in the net. zone, one should query a.gtld-servers.net.
So my question is, how to get out of this catch-22? How can I get the IP address of a.gtld-servers.net without having to do another DNS request?
dns
asked Nov 14 '18 at 17:51
TomTom
5719
add a comment |
When I do an nslookup on the net. zone, I get the following output:
nslookup -type=soa net 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
net
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1542217316
refresh = 1800
retry = 900
expire = 604800
minimum = 86400
Authoritative answers can be found from:
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net. However, the IP Address of a.gtld-servers.net is not given. This results in a catch-22, because in order to get the IP address of any subzone in the net. zone, one should query a.gtld-servers.net.
So my question is, how to get out of this catch-22? How can I get the IP address of a.gtld-servers.net without having to do another DNS request?
dns
asked Nov 14 '18 at 17:51
TomTom
5719
When I do an nslookup on the net. zone, I get the following output:
nslookup -type=soa net 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
net
origin = a.gtld-servers.net
mail addr = nstld.verisign-grs.com
serial = 1542217316
refresh = 1800
retry = 900
expire = 604800
minimum = 86400
Authoritative answers can be found from:
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net. However, the IP Address of a.gtld-servers.net is not given. This results in a catch-22, because in order to get the IP address of any subzone in the net. zone, one should query a.gtld-servers.net.
So my question is, how to get out of this catch-22? How can I get the IP address of a.gtld-servers.net without having to do another DNS request?
dns
dns
asked Nov 14 '18 at 17:51
TomTom
5719
asked Nov 14 '18 at 17:51
TomTom
5719
asked Nov 14 '18 at 17:51
TomTom
5719
asked Nov 14 '18 at 17:51
TomTom
5719
asked Nov 14 '18 at 17:51
TomTom
5719
5719
add a comment |
add a comment |
1 Answer
1
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votes
The root server addresses can be found in a file downloaded from iana
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net
You could, and at least initially, probably would, but the root servers don't move around frequently, so once you got the ip address for .net server, for example, you would use the cached value.
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
|
show 2 more comments
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1 Answer
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1 Answer
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active
oldest
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votes
The root server addresses can be found in a file downloaded from iana
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net
You could, and at least initially, probably would, but the root servers don't move around frequently, so once you got the ip address for .net server, for example, you would use the cached value.
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
|
show 2 more comments
The root server addresses can be found in a file downloaded from iana
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net
You could, and at least initially, probably would, but the root servers don't move around frequently, so once you got the ip address for .net server, for example, you would use the cached value.
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
|
show 2 more comments
The root server addresses can be found in a file downloaded from iana
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net
You could, and at least initially, probably would, but the root servers don't move around frequently, so once you got the ip address for .net server, for example, you would use the cached value.
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
The root server addresses can be found in a file downloaded from iana
This means that in order to get DNS records for the net. zone, one should query the DNS Server a.gtld-servers.net
You could, and at least initially, probably would, but the root servers don't move around frequently, so once you got the ip address for .net server, for example, you would use the cached value.
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
edited Nov 14 '18 at 18:04
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
answered Nov 14 '18 at 17:59
Terry CarmenTerry Carmen
2,5391818
2,5391818
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
|
show 2 more comments
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
Thank you for your answer. However, my computer doesn't have the file from iana and Google's public DNS (8.8.8.8) doesn't have it. So how can my computer get the ip address for .net server the first time? And more specifically: can I execute a command to get the actual IP Address?
– Tom
Nov 14 '18 at 18:09
1
1
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
Google doesn't have the file for you to download, but they do know the address and use it when you do a lookup.
– Terry Carmen
Nov 14 '18 at 18:14
1
1
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
FWIW, unless you have a special need of some sort, these aren't things you would normally need to deal with. You would use your ISP's DNS server or another public DNS server and they would handle your request.
– Terry Carmen
Nov 14 '18 at 18:25
1
1
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
True, but I just wanted to know how the black box works. Plus it might be interested for my AWS exam of which Route 53 is a topic.
– Tom
Nov 14 '18 at 18:27
1
1
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
All recursive nameservers are shipped with a given list of root servers (and their IPv4+IPv6 addresses) and at boot they will "prime" the root by querying any of known nameserver to grab the list of current root nameservers, in order to accomodate for changes. There are rare but do exist. Like in average at least one IPv4 or IPv6 address change per year.
– Patrick Mevzek
Nov 14 '18 at 18:29
|
show 2 more comments
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