diff --git a/README.md b/README.md
index 22a3e81..82a0118 100755
--- a/README.md
+++ b/README.md
@@ -70,6 +70,7 @@ Per-VDOM:
    * `fortigate_ippool_clients`
    * `fortigate_ippool_used_items`
    * `fortigate_ippool_total_items`
+   * `fortigate_ippool_pba_per_ip`
  * _System/Fortimanager/Status_
    * `fortigate_fortimanager_connection_status`
    * `fortigate_fortimanager_registration_status`
diff --git a/pkg/probe/firewall_ippool.go b/pkg/probe/firewall_ippool.go
index 2ff7203..5a58980 100644
--- a/pkg/probe/firewall_ippool.go
+++ b/pkg/probe/firewall_ippool.go
@@ -15,6 +15,7 @@ type IpPool struct {
 	Available float64 `json:"available"`
 	Used      int     `json:"used"`
 	Total     int     `json:"total"`
+	PbaPerIp  int     `json:"pba_per_ip"`
 }
 
 type IpPoolResponse struct {
@@ -67,6 +68,14 @@ func probeFirewallIpPool(c http.FortiHTTP, meta *TargetMetadata) ([]prometheus.M
 		)
 	)
 
+	var (
+		mPbaPerIp = prometheus.NewDesc(
+			"fortigate_ippool_pba_per_ip",
+			"Amount of available port block allocations per ip",
+			[]string{"vdom", "name"}, nil,
+		)
+	)
+
 	var rs []IpPoolResponse
 
 	if err := c.Get("api/v2/monitor/firewall/ippool", "vdom=*", &rs); err != nil {
@@ -84,6 +93,7 @@ func probeFirewallIpPool(c http.FortiHTTP, meta *TargetMetadata) ([]prometheus.M
 			m = append(m, prometheus.MustNewConstMetric(mClients, prometheus.GaugeValue, float64(ippool.Clients), r.VDOM, ippool.Name))
 			m = append(m, prometheus.MustNewConstMetric(mUsed, prometheus.GaugeValue, float64(ippool.Used), r.VDOM, ippool.Name))
 			m = append(m, prometheus.MustNewConstMetric(mTotal, prometheus.GaugeValue, float64(ippool.Total), r.VDOM, ippool.Name))
+			m = append(m, prometheus.MustNewConstMetric(mPbaPerIp, prometheus.GaugeValue, float64(ippool.PbaPerIp), r.VDOM, ippool.Name))
 		}
 	}
 
diff --git a/pkg/probe/firewall_ippool_test.go b/pkg/probe/firewall_ippool_test.go
index dbce34e..575ffe9 100644
--- a/pkg/probe/firewall_ippool_test.go
+++ b/pkg/probe/firewall_ippool_test.go
@@ -35,6 +35,9 @@ func TestFirewallIpPool(t *testing.T) {
 	# HELP fortigate_ippool_used_items Amount of items used in ippool
 	# TYPE fortigate_ippool_used_items gauge
 	fortigate_ippool_used_items{name="ippool_name",vdom="FG-traffic"} 0
+	# HELP fortigate_ippool_pba_per_ip Amount of available port block allocations per ip
+    # TYPE fortigate_ippool_pba_per_ip gauge
+    fortigate_ippool_pba_per_ip{name="ippool_name",vdom="FG-traffic"} 472
 	`
 	if err := testutil.GatherAndCompare(r, strings.NewReader(em)); err != nil {
 		t.Fatalf("metric compare: err %v", err)