A small 'stamp' sized “Break-out-Board” Module with W5500 chip + with 900mil distanced Pin-Headers 'Breadboard friendly' Footprint. The W5500's SPI I/F and PHY I/F is free available. You can use any RJ45 for the connection.
The W5500BoB Module is made by German company ESoPe.
Here pictures of Top and Bottom side:
The schemetic is here:
The Pinout of the Module in detail is here:
In the WIZnet EU's Blog is a nice explanation about how to connect RJ45 and make a short test setup.