Internet Provider Security (IPS) tags are used by domain registrar to administer a domain name registration service and related Domain Name System (DNS) services. An IPS tag is the label that applies to each registrar that registers domains in the country-code top level domain "uk" and is required to transfer domain names from one registrar to another.
DNS services are tired to IPS tags.
( z1 tire :ARG0 ( z2 tag :mod ( z3 protocol :name ( z4 name :op "IPS" ) ) ) :ARG1 ( z5 service :mod ( z6 protocol :name ( z7 name :op "DNS" ) ) ) )