diff --git a/ironic/drivers/modules/irmc/inspect.py b/ironic/drivers/modules/irmc/inspect.py
index 87b8fb9287..4e148ee5c5 100644
--- a/ironic/drivers/modules/irmc/inspect.py
+++ b/ironic/drivers/modules/irmc/inspect.py
@@ -110,7 +110,7 @@ def _get_mac_addresses(node):
                                   d_info['irmc_snmp_security'])
 
     node_classes = snmp_client.get_next(NODE_CLASS_OID)
-    mac_addresses = [':'.join(['%02x' % ord(x) for x in mac])
+    mac_addresses = [':'.join(['%02x' % x for x in mac])
                      for mac in snmp_client.get_next(MAC_ADDRESS_OID)]
 
     return [a for c, a in zip(node_classes, mac_addresses)
diff --git a/ironic/tests/unit/drivers/modules/irmc/test_inspect.py b/ironic/tests/unit/drivers/modules/irmc/test_inspect.py
index 0a6eeb399b..9eb8dbb85b 100644
--- a/ironic/tests/unit/drivers/modules/irmc/test_inspect.py
+++ b/ironic/tests/unit/drivers/modules/irmc/test_inspect.py
@@ -18,6 +18,8 @@ Test class for iRMC Inspection Driver
 
 from unittest import mock
 
+from pysnmp.proto import rfc1902
+
 from ironic.common import exception
 from ironic.common import states
 from ironic.common import utils
@@ -38,12 +40,23 @@ class IRMCInspectInternalMethodsTestCase(test_common.BaseIRMCTest):
     @mock.patch('ironic.drivers.modules.irmc.inspect.snmp.SNMPClient',
                 spec_set=True, autospec=True)
     def test__get_mac_addresses(self, snmpclient_mock):
+
+        # NOTE(yushiro): In pysnmp 4.4.12, SNMPClient returns following type:
+        # node classes: pysnmp.proto.rfc1902.Integer32
+        # mac addresses: pysnmp.proto.rfc1902.OctetString
         snmpclient_mock.return_value = mock.Mock(
-            **{'get_next.side_effect': [[2, 2, 7],
-                                        ['\xaa\xaa\xaa\xaa\xaa\xaa',
-                                         '\xbb\xbb\xbb\xbb\xbb\xbb',
-                                         '\xcc\xcc\xcc\xcc\xcc\xcc']]})
-        inspected_macs = ['aa:aa:aa:aa:aa:aa', 'bb:bb:bb:bb:bb:bb']
+            **{'get_next.side_effect': [
+                [
+                    rfc1902.Integer32(2),
+                    rfc1902.Integer32(2),
+                    rfc1902.Integer32(7)
+                ], [
+                    rfc1902.OctetString('\x90\x1b\x0e\xa5\x70\x37'),
+                    rfc1902.OctetString('\x90\x1b\x0e\xa5\x70\x38'),
+                    rfc1902.OctetString('\x90\x1b\x0e\xa5\x70\x39')
+                ]]}
+        )
+        inspected_macs = ['90:1b:0e:a5:70:37', '90:1b:0e:a5:70:38']
         with task_manager.acquire(self.context, self.node.uuid,
                                   shared=True) as task:
             result = irmc_inspect._get_mac_addresses(task.node)
diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3d89103c09..b0c82690c4 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -95,6 +95,7 @@ pyOpenSSL==19.1.0
 pyparsing==2.4.7
 pyperclip==1.8.0
 pysendfile==2.0.0
+pysnmp==4.4.12
 python-cinderclient==3.3.0
 python-dateutil==2.8.1
 python-editor==1.0.4
diff --git a/releasenotes/notes/fix-irmc-inspection-c9ae3864a96b2588.yaml b/releasenotes/notes/fix-irmc-inspection-c9ae3864a96b2588.yaml
new file mode 100644
index 0000000000..e3e717b2a5
--- /dev/null
+++ b/releasenotes/notes/fix-irmc-inspection-c9ae3864a96b2588.yaml
@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Fixed iRMC inspection for getting MAC address.
\ No newline at end of file
diff --git a/test-requirements.txt b/test-requirements.txt
index bb792c420b..fb628fe40e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -16,6 +16,7 @@ testtools>=2.2.0 # MIT
 WebTest>=2.0.27 # MIT
 bashate>=0.5.1 # Apache-2.0
 pycodestyle>=2.0.0,<2.6.0 # MIT
+pysnmp>=4.4.12
 flake8-import-order>=0.17.1 # LGPLv3
 Pygments>=2.2.0 # BSD
 bandit!=1.6.0,>=1.1.0,<2.0.0 # Apache-2.0