21


DNS delegation of 21 updated: May 26, 2013 5:47:07 AM

Delegation

stepqueryauthservers
121.in-addr.arpa..(b,m,e,l,g,d,h,k,c,a,j,i,f).root-servers.net.
221.in-addr.arpa.in-addr.arpa.(e,a,b,f,c,d).in-addr-servers.arpa.
We pick b.root-servers.net, one of the 13 root servers (1), and ask it about 21.in-addr.arpa and learn that in-addr.arpa is delegated to six name servers (2), so we ask e.in-addr-servers.arpa and get the following answer:

Authoritative answer

AUTHORITATIVE for 21.in-addr.arpa.
in-addr.arpa.3600SOAb.in-addr-servers.arpa. nstld.iana.org. ( 2011028517 1800 900 604800 3600 )
21. net. arpa. in-addr.arpa. root-servers.net. m.root-servers.net. a.root-servers.net. j.root-servers.net. h.root-servers.net. d.root-servers.net. i.root-servers.net. l.root-servers.net. k.root-servers.net. g.root-servers.net. f.root-servers.net. c.root-servers.net. b.root-servers.net. e.root-servers.net. in-addr-servers.arpa. b.in-addr-servers.arpa. e.in-addr-servers.arpa. c.in-addr-servers.arpa. d.in-addr-servers.arpa. f.in-addr-servers.arpa. a.in-addr-servers.arpa.
whois 21
whois net
whois arpa
whois in-addr.arpa
whois root-servers.net
whois in-addr-servers.arpa

whois 21
deep analysis of: 21
domain info api 21

RBL listing of 21
mnw
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