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Strange issues accessing youtube

We have a network where no one can access YouTube.  DNS is returning a bogus IP address and I cannot figure out where it is coming from (see nslookup below).  The response is not from Google's Public DNS server but from something else that must be in the middle of the lookups.  How can we determine where this bogus address is being returned from?  The firewall is a Cisco ASA, but I see nothing enabled there that would cause these types of issues.

C:\Users\Administrator>nslookup -debug www.youtube.com 8.8.8.8
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        8.8.8.8.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  8.8.8.8.in-addr.arpa
        name = google-public-dns-a.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)

------------
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        www.youtube.com, type = A, class = IN
    ANSWERS:
    ->  www.youtube.com
        internet address = 208.70.74.21
        ttl = 0 (0 secs)

------------
Non-authoritative answer:
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        www.youtube.com, type = AAAA, class = IN

------------
Name:    www.youtube.com
Address:  208.70.74.21

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Avatar of Craig Beck
Craig Beck
Flag of United Kingdom of Great Britain and Northern Ireland image

If you use 4.2.2.2 instead of 8.8.8.8 what do you get?  The nslookup looks fine from my PC...

C:\Users\User>nslookup -debug www.youtube.com 8.8.8.8
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        8.8.8.8.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  8.8.8.8.in-addr.arpa
        name = google-public-dns-a.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)

------------
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 9,  authority records = 0,  additional = 0

    QUESTIONS:
        www.youtube.com, type = A, class = IN
    ANSWERS:
    ->  www.youtube.com
        canonical name = youtube-ui.l.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.187
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.186
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.182
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.184
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.181
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.185
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.180
        ttl = 299 (4 mins 59 secs)
    ->  youtube-ui.l.google.com
        internet address = 31.55.167.183
        ttl = 299 (4 mins 59 secs)

------------
Non-authoritative answer:
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 3, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 2,  authority records = 0,  additional = 0

    QUESTIONS:
        www.youtube.com, type = AAAA, class = IN
    ANSWERS:
    ->  www.youtube.com
        canonical name = youtube-ui.l.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)
    ->  youtube-ui.l.google.com
        AAAA IPv6 address = 2a00:1450:400b:c02::5b
        ttl = 299 (4 mins 59 secs)

------------
Name:    youtube-ui.l.google.com
Addresses:  2a00:1450:400b:c02::5b
          31.55.167.187
          31.55.167.186
          31.55.167.182
          31.55.167.184
          31.55.167.181
          31.55.167.185
          31.55.167.180
          31.55.167.183
Aliases:  www.youtube.com

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SOLUTION
Avatar of Craig Beck
Craig Beck
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I'm in UK too.
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bdhtechnology

ASKER

In turns out the filtering system we use, iBoss, was rewriting the DNS queries.