diff --git a/client.go b/client.go
index 92e0a7b..a33903a 100644
--- a/client.go
+++ b/client.go
@@ -18,7 +18,7 @@ import (
 )
 
 const (
-	ClientVersion = "2.1.1"
+	ClientVersion = "2.2.0"
 	Endpoint      = "https://rest.messagebird.com"
 )
 
@@ -263,3 +263,54 @@ func (c *Client) OtpVerify(recipient string, token string, params *OtpParams) (*
 
 	return message, nil
 }
+
+// Lookup performs a new lookup for the specified number.
+func (c *Client) Lookup(phoneNumber string, params *LookupParams) (*Lookup, error) {
+	urlParams := paramsForLookup(params)
+	path := "lookup/" + phoneNumber + "?" + urlParams.Encode()
+
+	lookup := &Lookup{}
+	if err := c.request(lookup, path, nil); err != nil {
+		if err == ErrResponse {
+			return lookup, err
+		}
+
+		return nil, err
+	}
+
+	return lookup, nil
+}
+
+// NewLookupHLR creates a new HLR lookup for the specified number.
+func (c *Client) NewLookupHLR(phoneNumber string, params *LookupParams) (*HLR, error) {
+	urlParams := paramsForLookup(params)
+	path := "lookup/" + phoneNumber + "/hlr"
+
+	hlr := &HLR{}
+	if err := c.request(hlr, path, urlParams); err != nil {
+		if err == ErrResponse {
+			return hlr, err
+		}
+
+		return nil, err
+	}
+
+	return hlr, nil
+}
+
+// LookupHLR performs a HLR lookup for the specified number.
+func (c *Client) LookupHLR(phoneNumber string, params *LookupParams) (*HLR, error) {
+	urlParams := paramsForLookup(params)
+	path := "lookup/" + phoneNumber + "/hlr?" + urlParams.Encode()
+
+	hlr := &HLR{}
+	if err := c.request(hlr, path, nil); err != nil {
+		if err == ErrResponse {
+			return hlr, err
+		}
+
+		return nil, err
+	}
+
+	return hlr, nil
+}
diff --git a/lookup.go b/lookup.go
new file mode 100644
index 0000000..4b1b393
--- /dev/null
+++ b/lookup.go
@@ -0,0 +1,42 @@
+package messagebird
+
+import "net/url"
+
+type Formats struct {
+	E164          string
+	International string
+	National      string
+	Rfc3966       string
+}
+
+type Lookup struct {
+	Href          string
+	CountryCode   string
+	CountryPrefix int
+	PhoneNumber   int64
+	Type          string
+	Formats       Formats
+	HLR           *HLR
+}
+
+type LookupParams struct {
+	CountryCode string
+	Reference   string
+}
+
+func paramsForLookup(params *LookupParams) *url.Values {
+	urlParams := &url.Values{}
+
+	if params == nil {
+		return urlParams
+	}
+
+	if params.CountryCode != "" {
+		urlParams.Set("countryCode", params.CountryCode)
+	}
+	if params.Reference != "" {
+		urlParams.Set("reference", params.Reference)
+	}
+
+	return urlParams
+}
diff --git a/lookup_test.go b/lookup_test.go
new file mode 100644
index 0000000..7c9dbaf
--- /dev/null
+++ b/lookup_test.go
@@ -0,0 +1,102 @@
+package messagebird
+
+import (
+	"strconv"
+	"testing"
+)
+
+var lookupObject []byte = []byte(`{
+    "href":"https://rest.messagebird.com/lookup/31624971134",
+    "countryCode":"NL",
+    "countryPrefix":31,
+    "phoneNumber":31624971134,
+    "type":"mobile",
+    "formats":{
+        "e164":"+31624971134",
+        "international":"+31 6 24971134",
+        "national":"06 24971134",
+        "rfc3966":"tel:+31-6-24971134"
+    },
+    "hlr":{
+        "id":"6118d3f06566fcd0cdc8962h65065907",
+        "network":20416,
+        "reference":"referece2000",
+        "status":"active",
+        "createdDatetime":"2015-12-15T08:19:24+00:00",
+        "statusDatetime":"2015-12-15T08:19:25+00:00"
+    }
+}`)
+
+var lookupHLRObject []byte = []byte(`{
+    "id":"6118d3f06566fcd0cdc8962h65065907",
+    "network":20416,
+    "reference":"referece2000",
+    "status":"active",
+    "createdDatetime":"2015-12-15T08:19:24+00:00",
+    "statusDatetime":"2015-12-15T08:19:25+00:00"
+}`)
+
+func TestLookup(t *testing.T) {
+	SetServerResponse(200, lookupObject)
+
+	phoneNumber := "31624971134"
+	lookup, err := mbClient.Lookup(phoneNumber, &LookupParams{CountryCode: "NL"})
+	if err != nil {
+		t.Fatalf("Didn't expect error while doing the lookup: %s", err)
+	}
+
+	if lookup.Href != "https://rest.messagebird.com/lookup/31624971134" {
+		t.Errorf("Unexpected lookup href: %s", lookup.Href)
+	}
+	if strconv.FormatInt(lookup.PhoneNumber, 10) != phoneNumber {
+		t.Errorf("Unexpected lookup phoneNumber: %s", lookup.PhoneNumber)
+	}
+
+	if lookup.Formats.International != "+31 6 24971134" {
+		t.Errorf("Unexpected International format: %s", lookup.HLR.Reference)
+	}
+
+	if lookup.HLR != nil {
+		if lookup.HLR.Reference != "referece2000" {
+			t.Errorf("Unexpected hlr reference: %s", lookup.HLR.Reference)
+		}
+	} else {
+		t.Errorf("Unexpected empty hlr")
+	}
+}
+
+func checkHLR(t *testing.T, hlr *HLR) {
+	if hlr.Id != "6118d3f06566fcd0cdc8962h65065907" {
+		t.Errorf("Unexpected hlr id: %s", hlr.Id)
+	}
+	if hlr.Network != 20416 {
+		t.Errorf("Unexpected hlr network: %d", hlr.Network)
+	}
+	if hlr.Reference != "referece2000" {
+		t.Errorf("Unexpected hlr reference: %s", hlr.Reference)
+	}
+	if hlr.Status != "active" {
+		t.Errorf("Unexpected hlr status: %s", hlr.Status)
+	}
+}
+
+func TestLookupHLR(t *testing.T) {
+	SetServerResponse(200, lookupHLRObject)
+
+	hlr, err := mbClient.LookupHLR("31624971134", &LookupParams{CountryCode: "NL"})
+	if err != nil {
+		t.Fatalf("Didn't expect error while doing the lookup: %s", err)
+	}
+	checkHLR(t, hlr)
+}
+
+func TestNewLookupHLR(t *testing.T) {
+	SetServerResponse(201, lookupHLRObject)
+
+	hlr, err := mbClient.NewLookupHLR("31624971134", &LookupParams{CountryCode: "NL", Reference: "reference2000"})
+	if err != nil {
+		t.Fatalf("Didn't expect error while doing the lookup: %s", err)
+	}
+
+	checkHLR(t, hlr)
+}