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Why do all *.localhost.yarf.nl domains resolve to `127.0.0.1`?


Windows using the DNS suffix search list on all lookups, even valid FQDNs. How to stop this?Setting up DNS server on VPS on the internetCan't load certain websites in Mountain Lion which load fine on Win7 laptopBIND9 SERVFAIL Issue with Windows 2008 R2 DNS ServerAll steps to set up and resolve subdomain.localhost to 127.0.0.1?Why would xbcd.com resolve to the localhost (127.0.0.1) on Linux (Ubuntu) and Android?Resolve Subdomains to Full DomainsWhy does the registered domain name “localtest.me” resolve to 127.0.0.1?Why does Cloudflare's DNS not resolve some DuckDNS domains, while Google's does?.dev domains don't resolve













0















I discovered something funny today: all domains *.localhost.yarf.nl resolve to 127.0.0.1.




  • What is this?

  • Where is this documented?

  • I can not find references to it ...


Here some examples:



» dig aaa.localhost.yarf.nl

; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> aaa.localhost.yarf.nl
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18392
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;aaa.localhost.yarf.nl. IN A

;; ANSWER SECTION:
aaa.localhost.yarf.nl. 3244 IN A 127.0.0.1

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Mar 21 07:26:40 CET 2019
;; MSG SIZE rcvd: 66


And:



» dig whatisthis.localhost.yarf.nl

; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.localhost.yarf.nl
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27196
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;whatisthis.localhost.yarf.nl. IN A

;; ANSWER SECTION:
whatisthis.localhost.yarf.nl. 3600 IN A 127.0.0.1

;; Query time: 55 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Mar 21 07:26:52 CET 2019
;; MSG SIZE rcvd: 73


But:



» dig whatisthis.yarf.nl

; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.yarf.nl
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24959
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;whatisthis.yarf.nl. IN A

;; AUTHORITY SECTION:
yarf.nl. 300 IN SOA ns091.auroradns.eu. admin.auroradns.eu. 2019011601 86400 7200 604800 300

;; Query time: 38 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Mar 21 07:26:59 CET 2019
;; MSG SIZE rcvd: 107


And:



» dig yarf.nl

; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> yarf.nl
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13207
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;yarf.nl. IN A

;; ANSWER SECTION:
yarf.nl. 3600 IN A 5.157.81.33

;; Query time: 33 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Mar 21 07:27:06 CET 2019
;; MSG SIZE rcvd: 52








share



























    0















    I discovered something funny today: all domains *.localhost.yarf.nl resolve to 127.0.0.1.




    • What is this?

    • Where is this documented?

    • I can not find references to it ...


    Here some examples:



    » dig aaa.localhost.yarf.nl

    ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> aaa.localhost.yarf.nl
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18392
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;aaa.localhost.yarf.nl. IN A

    ;; ANSWER SECTION:
    aaa.localhost.yarf.nl. 3244 IN A 127.0.0.1

    ;; Query time: 0 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Thu Mar 21 07:26:40 CET 2019
    ;; MSG SIZE rcvd: 66


    And:



    » dig whatisthis.localhost.yarf.nl

    ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.localhost.yarf.nl
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27196
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;whatisthis.localhost.yarf.nl. IN A

    ;; ANSWER SECTION:
    whatisthis.localhost.yarf.nl. 3600 IN A 127.0.0.1

    ;; Query time: 55 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Thu Mar 21 07:26:52 CET 2019
    ;; MSG SIZE rcvd: 73


    But:



    » dig whatisthis.yarf.nl

    ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.yarf.nl
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24959
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;whatisthis.yarf.nl. IN A

    ;; AUTHORITY SECTION:
    yarf.nl. 300 IN SOA ns091.auroradns.eu. admin.auroradns.eu. 2019011601 86400 7200 604800 300

    ;; Query time: 38 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Thu Mar 21 07:26:59 CET 2019
    ;; MSG SIZE rcvd: 107


    And:



    » dig yarf.nl

    ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> yarf.nl
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13207
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;yarf.nl. IN A

    ;; ANSWER SECTION:
    yarf.nl. 3600 IN A 5.157.81.33

    ;; Query time: 33 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Thu Mar 21 07:27:06 CET 2019
    ;; MSG SIZE rcvd: 52








    share

























      0












      0








      0








      I discovered something funny today: all domains *.localhost.yarf.nl resolve to 127.0.0.1.




      • What is this?

      • Where is this documented?

      • I can not find references to it ...


      Here some examples:



      » dig aaa.localhost.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> aaa.localhost.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18392
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;aaa.localhost.yarf.nl. IN A

      ;; ANSWER SECTION:
      aaa.localhost.yarf.nl. 3244 IN A 127.0.0.1

      ;; Query time: 0 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:40 CET 2019
      ;; MSG SIZE rcvd: 66


      And:



      » dig whatisthis.localhost.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.localhost.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27196
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;whatisthis.localhost.yarf.nl. IN A

      ;; ANSWER SECTION:
      whatisthis.localhost.yarf.nl. 3600 IN A 127.0.0.1

      ;; Query time: 55 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:52 CET 2019
      ;; MSG SIZE rcvd: 73


      But:



      » dig whatisthis.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24959
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;whatisthis.yarf.nl. IN A

      ;; AUTHORITY SECTION:
      yarf.nl. 300 IN SOA ns091.auroradns.eu. admin.auroradns.eu. 2019011601 86400 7200 604800 300

      ;; Query time: 38 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:59 CET 2019
      ;; MSG SIZE rcvd: 107


      And:



      » dig yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13207
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;yarf.nl. IN A

      ;; ANSWER SECTION:
      yarf.nl. 3600 IN A 5.157.81.33

      ;; Query time: 33 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:27:06 CET 2019
      ;; MSG SIZE rcvd: 52








      share














      I discovered something funny today: all domains *.localhost.yarf.nl resolve to 127.0.0.1.




      • What is this?

      • Where is this documented?

      • I can not find references to it ...


      Here some examples:



      » dig aaa.localhost.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> aaa.localhost.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18392
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;aaa.localhost.yarf.nl. IN A

      ;; ANSWER SECTION:
      aaa.localhost.yarf.nl. 3244 IN A 127.0.0.1

      ;; Query time: 0 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:40 CET 2019
      ;; MSG SIZE rcvd: 66


      And:



      » dig whatisthis.localhost.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.localhost.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27196
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;whatisthis.localhost.yarf.nl. IN A

      ;; ANSWER SECTION:
      whatisthis.localhost.yarf.nl. 3600 IN A 127.0.0.1

      ;; Query time: 55 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:52 CET 2019
      ;; MSG SIZE rcvd: 73


      But:



      » dig whatisthis.yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> whatisthis.yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24959
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;whatisthis.yarf.nl. IN A

      ;; AUTHORITY SECTION:
      yarf.nl. 300 IN SOA ns091.auroradns.eu. admin.auroradns.eu. 2019011601 86400 7200 604800 300

      ;; Query time: 38 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:26:59 CET 2019
      ;; MSG SIZE rcvd: 107


      And:



      » dig yarf.nl

      ; <<>> DiG 9.11.3-1ubuntu1.5-Ubuntu <<>> yarf.nl
      ;; global options: +cmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13207
      ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

      ;; OPT PSEUDOSECTION:
      ; EDNS: version: 0, flags:; udp: 4096
      ;; QUESTION SECTION:
      ;yarf.nl. IN A

      ;; ANSWER SECTION:
      yarf.nl. 3600 IN A 5.157.81.33

      ;; Query time: 33 msec
      ;; SERVER: 127.0.0.1#53(127.0.0.1)
      ;; WHEN: Thu Mar 21 07:27:06 CET 2019
      ;; MSG SIZE rcvd: 52






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