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[Querying whois.iana.org]
[whois.iana.org]
% IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
% This query returned 1 object

inetnum: 227.0.0.0 - 227.255.255.255
organisation: Multicast
status: RESERVED

remarks: Multicast (formerly "Class D") [RFC5771]registered
remarks: inmulticast-addresses

changed: 1981-09
source: IANA