diff --git a/sdcm/cluster.py b/sdcm/cluster.py
index 6540fbc6cc..8f4b7f5a4b 100644
--- a/sdcm/cluster.py
+++ b/sdcm/cluster.py
@@ -2742,7 +2742,8 @@ def get_peers_info(self):
         for row in cql_results:
             peer = row.peer
             try:
-                ipaddress.ip_address(row.peer)
+                # make sure we use ipv6 long format (some tools remove leading zeros)
+                peer = ipaddress.ip_address(row.peer).exploded
             except ValueError as exc:
                 current_err = f"Peer '{peer}' is not an IP address, err: {exc}\n"
                 LOGGER.warning(current_err)
@@ -2774,7 +2775,8 @@ def get_gossip_info(self) -> dict[BaseNode, dict]:
             if line.startswith('SCHEMA:'):
                 schema = line.replace('SCHEMA:', '')
             elif line.startswith('RPC_ADDRESS:'):
-                ip = line.replace('RPC_ADDRESS:', '')
+                # make sure we use ipv6 long format (some tools remove leading zeros)
+                ip = ipaddress.ip_address(line.replace('RPC_ADDRESS:', '')).exploded
             elif line.startswith('STATUS:'):
                 status = line.replace('STATUS:', '').split(',')[0]
             elif line.startswith('DC:'):
diff --git a/sdcm/cluster_aws.py b/sdcm/cluster_aws.py
index 63d21a5c2e..3bd04df74d 100644
--- a/sdcm/cluster_aws.py
+++ b/sdcm/cluster_aws.py
@@ -12,7 +12,7 @@
 # Copyright (c) 2020 ScyllaDB
 
 # pylint: disable=too-many-lines, too-many-public-methods
-
+import ipaddress
 import json
 import logging
 import os
@@ -460,7 +460,9 @@ def network_interfaces(self):
         for interface in self._instance.network_interfaces:
             private_ip_addresses = [private_address["PrivateIpAddress"]
                                     for private_address in interface.private_ip_addresses]
-            ipv6_addresses = [ipv6_address['Ipv6Address'] for ipv6_address in interface.ipv6_addresses]
+            # make sure we use ipv6 long format (some tools remove leading zeros)
+            ipv6_addresses = [ipaddress.ip_address(
+                ipv6_address['Ipv6Address']).exploded for ipv6_address in interface.ipv6_addresses]
             device_indexes.append(interface.attachment['DeviceIndex'])
             ipv4_public_address = interface.association_attribute['PublicIp'] if interface.association_attribute else None
             dns_public_name = interface.association_attribute['PublicDnsName'] if interface.association_attribute else None