How to get load balancer info when we know backend server details

Summary: Sometimes application team requests to change backup mode of backend servers and they only give backend servers name/ip and listener port.How to back track the load balancer associated with those backend servers.What I can think is in the security list of backend server subnet there should be an ingress traffic rule which can tell us subnet of LB with port number.

How do I use that information to find the load balancer? There may be lots of load balancer under a compartment and finding that load balancer mapped with that specific subnet is very time consuming.