mnordhoff

$ dig +nssearch int
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030132 3600 1800 604800 3600 from server 137.39.1.3 in 0 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 199.43.133.53 in 12 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 199.43.135.53 in 12 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 2001:500:8d::53 in 12 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 2001:500:8f::53 in 12 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 199.43.134.53 in 16 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 2001:500:8e::53 in 48 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 2001:67c:e0::4 in 84 ms.
SOA sns.dns.icann.org. noc.dns.icann.org. 2024030137 3600 1800 604800 3600 from server 193.0.9.4 in 88 ms.

mnordhoff

$ dpkg -l bind9
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version            Architecture Description
+++-==============-==================-============-=================================
ii  bind9          1:9.18.18-0ubuntu2 amd64        Internet Domain Name Server

$ named -V                    
BIND 9.18.18-0ubuntu2-Ubuntu (Extended Support Version) <id:>

mnordhoff

🔒  ai.  3232  MX  10 mail.offshore.ai.
🔓  gt.  14400  MX  10 aspmx.l.google.com.
🔓  gt.  14400  MX  20 alt1.aspmx.l.google.com.
🔓  gt.  14400  MX  20 alt2.aspmx.l.google.com.
🔓  gt.  14400  MX  30 aspmx2.googlemail.com.
🔓  gt.  14400  MX  30 aspmx4.googlemail.com.
🔓  gt.  14400  MX  30 aspmx5.googlemail.com.
🔒  ws.  21600  MX  10 mail.worldsite.ws.
🔒  ua.  18081  MX  10 mr.kolo.net.
🔒  hr.  7200   MX  5 alpha.carnet.hr.

mnordhoff

_checkSudo() {
  if [ -z "__INTERACTIVE" ]; then
    #don't check if it's not in an interactive shell
    return 0
  fi
  if [ "$SUDO_GID" ] && [ "$SUDO_COMMAND" ] && [ "$SUDO_USER" ] && [ "$SUDO_UID" ]; then
    if [ "$SUDO_USER" = "root" ] && [ "$SUDO_UID" = "0" ]; then
      #it's root using sudo, no matter it's using sudo or not, just fine
      return 0
    fi

mnordhoff

$ dig +dnssec +norecurse @av2.nstld.com blog.verisign.com

; <<>> DiG 9.19.13-1+ubuntu20.04.1+isc+1-Ubuntu <<>> +dnssec +norecurse @av2.nstld.com blog.verisign.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27084
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 5, ADDITIONAL: 7

;; OPT PSEUDOSECTION:

mnordhoff

$ dig +dnssec +norecurse +nsid @c.in-addr-servers.arpa 74.in-addr.arpa

; <<>> DiG 9.19.10-1+ubuntu20.04.1+isc+2-Ubuntu <<>> +dnssec +norecurse +nsid @c.in-addr-servers.arpa 74.in-addr.arpa
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56431
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

mnordhoff

# Python regular expressions for IPv4 and IPv6 addresses and URI-references,
# based on RFC 3986's ABNF.
#
# ipv4_address and ipv6_address are self-explanatory.
# ipv6_addrz requires a zone ID (RFC 6874) follow the IPv6 address.
# ipv6_address_or_addrz allows an IPv6 address with optional zone ID.
# uri_reference is what you think of as a URI. (It uses ipv6_address_or_addrz.)

import re

mnordhoff

$ mtr -brwz d0.org.afilias-nst.org
Start: 2022-09-07T01:55:07+0000
HOST: ultimate                                                              Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. AS63949  2600:3c02::1                                                   0.0%    10    0.6   0.8   0.5   2.1   0.5
  2. AS63949  2600:3c0f:4:35::3                                              0.0%    10    0.4   0.6   0.4   1.7   0.4
  3. AS???    fd04:1:1eaf:3:1::1                                             0.0%    10    3.4   2.6   0.6   9.7   2.9
  4. AS???    fd04:1:b:2:1::2                                                0.0%    10    0.5   1.6   0.4  10.3   3.1
  5. AS20940  ae45.r12.atl01.ien.netarch.akamai.com (2600:1488:a1c0::18)     0.0%    10    0.5   1.1   0.5   3.6   1.1
  6. AS20940  ae8.r02.atl01.icn.netarch.akamai.com (2600:1488:a1c0:405::a)   0.0%    10    0.6   0.8   0.6   1.6   0.3
  7. AS20940  ae10.r01.dfw01.icn.netarch.akamai.com (2600:1488:5fc3:52::a)   0.0%    10   65.7  46.4  19.0 137.2  36.7

mnordhoff

$ dig @e.fi -4 +dnssec +norecurse +nsid fi soa

; <<>> DiG 9.19.4-1+ubuntu20.04.1+isc+1-Ubuntu <<>> @e.fi -4 +dnssec +norecurse +nsid fi soa
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20518
;; flags: qr aa; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

mnordhoff

mnordhoff@ultimate:~$ for i in 139.162.130.5 139.162.131.5 139.162.132.5 139.162.133.5 139.162.134.5 139.162.135.5 139.162.136.5 139.162.137.5 139.162.138.5 139.162.139.5 2a01:7e01::5 2a01:7e01::9 2a01:7e01::7 2a01:7e01::c 2a01:7e01::2 2a01:7e01::4 2a01:7e01::3 2a01:7e01::6 2a01:7e01::b 2a01:7e01::8; do echo $i; dig +vc +timeout=2 +tries=2 example.com @$i; done
139.162.130.5
;; Connection to 139.162.130.5#53(139.162.130.5) for example.com failed: timed out.
;; Connection to 139.162.130.5#53(139.162.130.5) for example.com failed: timed out.
139.162.131.5
;; Connection to 139.162.131.5#53(139.162.131.5) for example.com failed: timed out.
;; Connection to 139.162.131.5#53(139.162.131.5) for example.com failed: timed out.
139.162.132.5

; <<>> DiG 9.19.2-1+ubuntu20.04.1+isc+1-Ubuntu <<>> +vc +timeout +tries example.com @139.162.132.5