Similar to HTTPの持続的接続
.hm
.hm.hn
.hn.ht
.htIdenti.ca
Identi.ca.ir
.ir.kg
.kg.km
.kmLabel Distribution Protocol
Label Distribution Protocol.lc
.lc.lt
.lt.md
.md.mh
.mhMyHeritage
MyHeritage.no
.no.pf
.pf.py
.py.qa
.qa.rs
.rsSemantic Scholar
Semantic ScholarShiftyLook
ShiftyLook.si
.si.sl
.sl.sm
.sm.sn
.sn.sr
.sr.ss
.ss.st
.st.sy
.sy