diff --git a/src/go/pt-secure-collect/sanitize/sanitize.go b/src/go/pt-secure-collect/sanitize/sanitize.go
index a18c3ba4..b2d3f7b5 100644
--- a/src/go/pt-secure-collect/sanitize/sanitize.go
+++ b/src/go/pt-secure-collect/sanitize/sanitize.go
@@ -8,7 +8,7 @@ import (
 )
 
 var (
-	hostnameRE    = regexp.MustCompile(`(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)+([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-][A-Za-z0-9]){2,3}(?:\W)`)
+	hostnameRE    = regexp.MustCompile(`(([a-zA-Z0-9]|[a-zA-Z0-9\-]*[a-zA-Z0-9])\.)+([A-Za-z]+)|([0-9]{1,3}\.){3}[0-9]{1,3}`)
 	queryLineRe   []*regexp.Regexp
 	queryInLineRe []*regexp.Regexp
 )
diff --git a/src/go/pt-secure-collect/sanitize/sanitize_test.go b/src/go/pt-secure-collect/sanitize/sanitize_test.go
new file mode 100644
index 00000000..57da5abe
--- /dev/null
+++ b/src/go/pt-secure-collect/sanitize/sanitize_test.go
@@ -0,0 +1,54 @@
+package sanitize
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/kr/pretty"
+)
+
+func TestSanitizeHostnames(t *testing.T) {
+
+	want := []string{
+		"top - 20:05:17 up 10 days, 16:27, 1 user, load average: 0.01, 0.15, 0.19",
+		"Tasks: 115 total, 1 running, 114 sleeping, 0 stopped, 0 zombie",
+		"%Cpu(s): 1.0 us, 0.3 sy, 0.0 ni, 98.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st",
+		"KiB Mem : 3881748 total, 147324 free, 1892824 used, 1841600 buff/cache",
+		"KiB Swap: 1572860 total, 1572748 free, 112 used. 1609372 avail Mem",
+		"",
+		"PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND",
+		"5304 vagrant 20 0 1983280 1.327g 12272 S 2.3 35.8 456:34.90 prometheus",
+		"5313 root 20 0 142100 16952 5428 S 1.0 0.4 189:16.81 node_exporter		",
+	}
+	lines := make([]string, len(want))
+	copy(lines, want)
+	sanitizeHostnames(lines)
+	if !reflect.DeepEqual(lines, want) {
+		pretty.Println(want)
+		pretty.Println(lines)
+		t.Error("structures don't match")
+	}
+
+	lines = []string{
+		"top - 20:05:17 up 10 days, 16:27, 1 user, load average: 0.01, 0.15, 0.19",
+		"Tasks: 115 total, 1 running, 114 sleeping, 0 stopped, 0 zombie",
+		"%Cpu(s): 1.0 us, 0.3 sy, 0.0 ni, 98.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st",
+		"lets put a host name here: domain.com",
+		"and put an ip address here: 10.0.0.1",
+		"and put a non ip address here: 10.0",
+	}
+	want = []string{
+		"top - 20:05:17 up 10 days, 16:27, 1 user, load average: 0.01, 0.15, 0.19",
+		"Tasks: 115 total, 1 running, 114 sleeping, 0 stopped, 0 zombie",
+		"%Cpu(s): 1.0 us, 0.3 sy, 0.0 ni, 98.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st",
+		"lets put a host name here: hostname",
+		"and put an ip address here: hostname",
+		"and put a non ip address here: 10.0",
+	}
+	sanitizeHostnames(lines)
+	if !reflect.DeepEqual(lines, want) {
+		t.Error("structures don't match")
+		pretty.Println(want)
+		pretty.Println(lines)
+	}
+}