The European Region
RIPE is the RIR with the most liberal transfer policies. In RIPE legacy address blocks can be bought and sold (even partial blocks) without a needs test and without the requirement that the recipient become a RIPE member or that the addresses lose their legacy status.
RIPE provides some services for market participants, including a list of recognized brokers and a list where buyers and sellers can post need and availability. RIPE also provides a log of all intra-RIPE transfers and inter-regional RIPE transfers. IPTrading is a long-time recognized RIPE Broker.
IPTrading is also a RIPE member and LIR and has access to the RIPE Transfer listing service, which is restricted to RIPE members only.
RIPE transfers can be tricky, with various requirements for the different types of addresses transferred. For example, PI transfers require an LIR sponsor, and as a RIPE LIR, IPTrading can assist in these cases.
RIPE addresses can be transferred to account holders at RIPE, ARIN, or
RIPE does not charge any transfer fees, but it does restrict resale of transferred addresses for two years after the transfer.