POST /propmap/lookup/pid HTTP/1.1
Host: alto.example.com
Accept: application/alto-propmap+json,application/alto-error+json
Content-Length: 222
Content-Type: application/alto-propmapparams+json

{
  "entities" : [
                "ipv4:192.0.2.128",
                "ipv4:192.0.2.0/27",
                "ipv4:192.0.3.0/27" ],
  "properties" : [ "default-network-map.pid",
                   "alt-network-map.pid" ]
}