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  • Public DNS Services

    From Lawrence D'Oliveiro@21:1/5 to All on Mon Sep 2 01:51:38 2024
    We all know about the public DNS services offered by Google (8.8.8.8,
    8.8.4.4) and Cloudflare (1.1.1.1, 1.0.0.1); did you know these
    addresses have names as well? And of course there are IPv6 addresses to
    go with the IPv4 ones.

    Try this command to find out all the related Google DNS services:

    host -a dns.google.

    (Yup, that’s “dns.google.”, no “.com” or anything else on the end.) That’s quite a breathtaking list of entries.

    For Cloudflare, try

    host one.one.one.one.

    Note that the “-a” option (“tell me everything”) doesn’t work with Cloudflare; quite a few online services are now imposing restrictions
    on these “all info” lookups, but clearly not Google, at least not on
    this domain: obviously they want it to remain easy for people to
    discover the services they’re offering.

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  • From Johanne Fairchild@21:1/5 to All on Sun Sep 1 22:53:50 2024
    Useful info. Thanks.

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  • From Joerg Walther@21:1/5 to Lawrence D'Oliveiro on Mon Sep 2 17:15:21 2024
    Lawrence D'Oliveiro wrote:


    Try this command to find out all the related Google DNS services:

    host -a dns.google.

    joerg@jazz:~$ host -a dns.google
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    Ubuntu 22.04, btw.


    For Cloudflare, try

    host one.one.one.one.

    This one works.

    -jw-
    --
    And now for something completely different...

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  • From George Musk@21:1/5 to Lawrence D'Oliveiro on Mon Sep 2 18:07:31 2024
    On Mon, 2 Sep 2024 01:51:38 -0000 (UTC), Lawrence D'Oliveiro wrote:

    We all know about the public DNS services offered by Google (8.8.8.8, 8.8.4.4) and Cloudflare (1.1.1.1, 1.0.0.1); did you know these addresses
    have names as well? And of course there are IPv6 addresses to go with
    the IPv4 ones.

    There are some more https://en.wikipedia.org/wiki/Public_recursive_name_server#Notable_public_DNS_service_operators

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  • From Lawrence D'Oliveiro@21:1/5 to All on Mon Sep 2 21:54:58 2024
    On Mon, 2 Sep 2024 01:51:38 -0000 (UTC), I wrote:

    Try this command to find out all the related Google DNS services:

    host -a dns.google.

    That’s quite a breathtaking list of entries.

    Anyone spotted the easter egg yet?

    --- SoupGate-Win32 v1.05
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  • From Lawrence D'Oliveiro@21:1/5 to Joerg Walther on Mon Sep 2 21:54:26 2024
    On Mon, 02 Sep 2024 17:15:21 +0200, Joerg Walther wrote:

    Lawrence D'Oliveiro wrote:

    host -a dns.google.

    joerg@jazz:~$ host -a dns.google
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    I did write “dns.google.”, did I not?

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  • From SH@21:1/5 to Lawrence D'Oliveiro on Tue Sep 3 08:39:11 2024
    On 02/09/2024 02:51, Lawrence D'Oliveiro wrote:
    We all know about the public DNS services offered by Google (8.8.8.8, 8.8.4.4) and Cloudflare (1.1.1.1, 1.0.0.1); did you know these
    addresses have names as well? And of course there are IPv6 addresses to
    go with the IPv4 ones.

    Try this command to find out all the related Google DNS services:

    host -a dns.google.

    (Yup, that’s “dns.google.”, no “.com” or anything else on the end.) That’s quite a breathtaking list of entries.

    For Cloudflare, try

    host one.one.one.one.

    Note that the “-a” option (“tell me everything”) doesn’t work with Cloudflare; quite a few online services are now imposing restrictions
    on these “all info” lookups, but clearly not Google, at least not on
    this domain: obviously they want it to remain easy for people to
    discover the services they’re offering.

    C:\Users\public>host

    'host' is not recognized as an internal or external command,
    operable program or batch file.

    (On Windows 11)

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  • From Andy Burns@21:1/5 to All on Tue Sep 3 09:30:10 2024
    SH wrote:

    'host' is not recognized as an internal or external command,
    operable program or batch file.

    (On Windows 11)

    use nslookup instead

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  • From Joerg Walther@21:1/5 to Lawrence D'Oliveiro on Tue Sep 3 16:11:44 2024
    Lawrence D'Oliveiro wrote:

    I did write “dns.google.”, did I not?

    It works with nslookup, though

    joerg@jazz:~$ nslookup dns.google.
    Server: 192.168.1.18
    Address: 192.168.1.18#53

    Non-authoritative answer:
    Name: dns.google
    Address: 8.8.8.8
    Name: dns.google
    Address: 8.8.4.4
    Name: dns.google
    Address: 2001:4860:4860::8844
    Name: dns.google
    Address: 2001:4860:4860::8888

    -jw-
    --
    And now for something completely different...

    --- SoupGate-Win32 v1.05
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  • From Joerg Walther@21:1/5 to Lawrence D'Oliveiro on Tue Sep 3 16:09:36 2024
    Lawrence D'Oliveiro wrote:

    joerg@jazz:~$ host -a dns.google
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    I did write “dns.google.”, did I not?

    That's what the system changed it to before actually issuing the
    command.

    joerg@jazz:~$ host -a dns.google.
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    -jw-
    --
    And now for something completely different...

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  • From Marco Moock@21:1/5 to All on Tue Sep 3 19:50:52 2024
    On 02.09.2024 um 01:51 Uhr Lawrence D'Oliveiro wrote:

    We all know about the public DNS services offered by Google (8.8.8.8, 8.8.4.4) and Cloudflare (1.1.1.1, 1.0.0.1); did you know these
    addresses have names as well? And of course there are IPv6 addresses
    to go with the IPv4 ones.

    Yes, but I only use them for testing.
    I run my own resolver with BIND9 on my machines at home.

    --
    kind regards
    Marco

    Send spam to 1725234698muell@cartoonies.org

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  • From SH@21:1/5 to Joerg Walther on Tue Sep 3 22:07:06 2024
    On 03/09/2024 15:11, Joerg Walther wrote:
    Lawrence D'Oliveiro wrote:

    I did write “dns.google.”, did I not?

    It works with nslookup, though

    joerg@jazz:~$ nslookup dns.google.
    Server: 192.168.1.18
    Address: 192.168.1.18#53

    Non-authoritative answer:
    Name: dns.google
    Address: 8.8.8.8
    Name: dns.google
    Address: 8.8.4.4
    Name: dns.google
    Address: 2001:4860:4860::8844
    Name: dns.google
    Address: 2001:4860:4860::8888

    -jw-

    Done the nslookup command and I get:

    Name: dns.google
    Addresses: ::
    0.0.0.0

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  • From Lawrence D'Oliveiro@21:1/5 to Joerg Walther on Tue Sep 3 22:02:44 2024
    On Tue, 03 Sep 2024 16:09:36 +0200, Joerg Walther wrote:

    Lawrence D'Oliveiro wrote:

    joerg@jazz:~$ host -a dns.google
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    I did write “dns.google.”, did I not?

    That's what the system changed it to before actually issuing the
    command.

    joerg@jazz:~$ host -a dns.google.
    Trying "dns.google"
    Host dns.google not found: 4(NOTIMP)

    Odd. Trouble with your ISP’s caching name servers?

    Try specifically addressing the query to a known-good name server, e.g.

    host -a dns.google. 8.8.8.8

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  • From Lawrence D'Oliveiro@21:1/5 to Andy Burns on Tue Sep 3 23:04:47 2024
    On Tue, 3 Sep 2024 09:30:10 +0100, Andy Burns wrote:

    (On Windows 11)

    use nslookup instead

    Doesn’t seem to have the equivalent of the “-a” option of host.

    host -a dns.google. | grep -c '^dns'
    26

    I get 26 lines of info; how many lines do you get?

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  • From Andy Burns@21:1/5 to Lawrence D'Oliveiro on Wed Sep 4 10:19:30 2024
    Lawrence D'Oliveiro wrote:

    Andy Burns wrote:

    use nslookup instead

    Doesn’t seem to have the equivalent of the “-a” option of host.

    host -a dns.google. | grep -c '^dns'
    26

    I get 26 lines of info; how many lines do you get?

    windows
    =======
    C:\Users\Andy>nslookup dns.google. 192.168.1.1
    Server: UnKnown
    Address: 192.168.1.1

    Non-authoritative answer:
    Name: dns.google
    Addresses: 2001:4860:4860::8844
    2001:4860:4860::8888
    8.8.4.4
    8.8.8.8

    wsl2
    ====

    root@YogaHome:~# nslookup dns.google. 192.168.1.1
    Server: 192.168.1.1
    Address: 192.168.1.1#53

    Non-authoritative answer:
    Name: dns.google
    Address: 8.8.4.4
    Name: dns.google
    Address: 8.8.8.8
    Name: dns.google
    Address: 2001:4860:4860::8844
    Name: dns.google
    Address: 2001:4860:4860::8888



    the "host -a" seems to rely on the DNS server supporting queries over
    TCP as well as UDP, my Draytek router only supports UDP

    root@YogaHome:~# host -a dns.google. 192.168.1.1
    Trying "dns.google"
    Trying "dns.google"
    ;; Connection to 192.168.1.1#53(192.168.1.1) for dns.google. failed:
    timed out.
    ;; no servers could be reached


    Using other DNS servers which do support TCP, the amount of info
    returned seems to depend on what types of RR they support, mainly DNSSEC?

    root@YogaHome:~# host -a dns.google. 9.9.9.9 | wc -l
    27
    root@YogaHome:~# host -a dns.google. 8.8.8.8 | wc -l
    42
    root@YogaHome:~# host -a dns.google. 94.247.43.254 | wc -l
    17

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  • From Lawrence D'Oliveiro@21:1/5 to Andy Burns on Wed Sep 4 09:28:21 2024
    On Wed, 4 Sep 2024 10:19:30 +0100, Andy Burns wrote:

    the "host -a" seems to rely on the DNS server supporting queries over
    TCP as well as UDP, my Draytek router only supports UDP

    Try going direct.

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  • From Andy Burns@21:1/5 to Lawrence D'Oliveiro on Wed Sep 4 11:22:19 2024
    Lawrence D'Oliveiro wrote:

    Andy Burns wrote:

    the "host -a" seems to rely on the DNS server supporting queries over
    TCP as well as UDP, my Draytek router only supports UDP

    Try going direct.

    The outputs showing up to 42 lines of output were from when I did that,
    but I have no need to know all those RRSIG/DNSKEY answers

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  • From Lawrence D'Oliveiro@21:1/5 to All on Wed Sep 11 23:36:50 2024
    On Mon, 2 Sep 2024 21:54:58 -0000 (UTC), I wrote:

    On Mon, 2 Sep 2024 01:51:38 -0000 (UTC), I wrote:

    Try this command to find out all the related Google DNS services:

    host -a dns.google.

    That’s quite a breathtaking list of entries.

    Anyone spotted the easter egg yet?

    dns.google. 300 IN TXT "https://xkcd.com/1361/"

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