Specifically, the ATS supports
FIX 4.2.
The ATS provides a range of IP addresses for each requested connection, or the Subscriber provides the
ATS with a range of unique globally routable addresses assigned to the Subscriber, from which the
Subscriber will be able to connect, and the ATS then configures its network routers to only allow access
from the Subscriber’s IP address to a dedicated IP address on the ATS’s order handling network. In this
way, only authorized Subscribers can gain access to IEX via registered physical IP addresses.
Connectivity to the ATS occurs through secure points of entry. Subscribers are responsible for
safeguarding their access to the ATS and for notifying the ATS upon learning if any such safeguards have
been compromised.
IEX publishes "TOPS", a real-time non-protected top of book quote feed.