diff --git a/README.md b/README.md
index 86ae8a1d7..eb38daba4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
   <a href="https://github.com/aligungr/UERANSIM"><img src="/.github/logo.png" width="75" title="UERANSIM"></a>
 </p>
 <p align="center">
-<img src="https://img.shields.io/badge/UERANSIM-v3.2.2-blue" />
+<img src="https://img.shields.io/badge/UERANSIM-v3.2.3-blue" />
 <img src="https://img.shields.io/badge/3GPP-R15-orange" />
 <img src="https://img.shields.io/badge/License-GPL--3.0-green"/>
 </p>
diff --git a/config/custom-ue.yaml b/config/custom-ue.yaml
index dc21a86a9..7672bb2f0 100644
--- a/config/custom-ue.yaml
+++ b/config/custom-ue.yaml
@@ -1,4 +1,4 @@
-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-286010000000001'
 # Mobile Country Code value of HPLMN
 mcc: '286'
diff --git a/config/free5gc-ue.yaml b/config/free5gc-ue.yaml
index bc47dd696..3a4725cc4 100644
--- a/config/free5gc-ue.yaml
+++ b/config/free5gc-ue.yaml
@@ -1,4 +1,4 @@
-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-208930000000003'
 # Mobile Country Code value of HPLMN
 mcc: '208'
diff --git a/config/open5gs-ue.yaml b/config/open5gs-ue.yaml
index 9f893cacd..ad85e0beb 100644
--- a/config/open5gs-ue.yaml
+++ b/config/open5gs-ue.yaml
@@ -1,4 +1,4 @@
-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-901700000000001'
 # Mobile Country Code value of HPLMN
 mcc: '901'
diff --git a/src/utils/common_types.cpp b/src/utils/common_types.cpp
index 0cddc21a5..0ba6eeb59 100644
--- a/src/utils/common_types.cpp
+++ b/src/utils/common_types.cpp
@@ -19,7 +19,7 @@ Supi Supi::Parse(const std::string &supi)
     if (supi[0] == 'i' && supi[1] == 'm' && supi[2] == 's' && supi[3] == 'i' && supi[4] == '-')
     {
         std::string val = supi.substr(5);
-        if (val.size() != 15 && val.size() != 16)
+        if (val.size() != 15)
             throw std::runtime_error("invalid IMSI value");
         for (char c : val)
             if (c < '0' || c > '9')
diff --git a/src/utils/constants.hpp b/src/utils/constants.hpp
index 3bec6833b..2d1b669b7 100644
--- a/src/utils/constants.hpp
+++ b/src/utils/constants.hpp
@@ -15,10 +15,10 @@ struct cons
     // Version information
     static constexpr const uint8_t Major = 3;
     static constexpr const uint8_t Minor = 2;
-    static constexpr const uint8_t Patch = 2;
+    static constexpr const uint8_t Patch = 3;
     static constexpr const char *Project = "UERANSIM";
-    static constexpr const char *Tag = "v3.2.2";
-    static constexpr const char *Name = "UERANSIM v3.2.2";
+    static constexpr const char *Tag = "v3.2.3";
+    static constexpr const char *Name = "UERANSIM v3.2.3";
     static constexpr const char *Owner = "ALİ GÜNGÖR";
 
     // Some port values
diff --git a/src/utils/io.cpp b/src/utils/io.cpp
index d2345484b..218272dcd 100644
--- a/src/utils/io.cpp
+++ b/src/utils/io.cpp
@@ -14,10 +14,16 @@
 #include <queue>
 #include <stack>
 
+#include <arpa/inet.h>
 #include <dirent.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <netdb.h>
 
 #include <utils/constants.hpp>
 #include <utils/libc_error.hpp>
@@ -183,4 +189,68 @@ void AppendPath(std::string &source, const std::string &target)
     source += target;
 }
 
+std::string GetIp4OfInterface(const std::string &ifName)
+{
+    std::string res;
+
+    struct ifreq ifr = {};
+
+    int fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (fd <= 0)
+        return "";
+
+    ifr.ifr_addr.sa_family = AF_INET;
+    strncpy(ifr.ifr_name, ifName.c_str(), IFNAMSIZ - 1);
+
+    if (ioctl(fd, SIOCGIFADDR, &ifr))
+    {
+        close(fd);
+        return "";
+    }
+
+    close(fd);
+
+    auto address = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
+
+    char str[INET_ADDRSTRLEN] = {0};
+    if (inet_ntop(AF_INET, &address, str, INET_ADDRSTRLEN) == nullptr)
+        return "";
+
+    return std::string{str};
+}
+
+std::string GetHostByName(const std::string &name)
+{
+    struct addrinfo hints = {};
+
+    hints.ai_family = PF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags |= AI_CANONNAME;
+
+    auto* res = gethostbyname(name.c_str());
+    if (res == nullptr)
+        return "";
+    if (res->h_addr_list == nullptr)
+        return "";
+
+    if (res->h_addrtype == AF_INET)
+    {
+        char str[INET_ADDRSTRLEN] = {0};
+        if (inet_ntop(AF_INET, res->h_addr_list[0], str, INET_ADDRSTRLEN) == nullptr)
+            return "";
+        return std::string{str};
+    }
+    else if (res->h_addrtype == AF_INET)
+    {
+        char str[INET6_ADDRSTRLEN] = {0};
+        if (inet_ntop(AF_INET6, res->h_addr_list[0], str, INET6_ADDRSTRLEN) == nullptr)
+            return "";
+        return std::string{str};
+    }
+    else
+    {
+        return "";
+    }
+}
+
 } // namespace io
diff --git a/src/utils/io.hpp b/src/utils/io.hpp
index ae0163ba1..dd9cbbf63 100644
--- a/src/utils/io.hpp
+++ b/src/utils/io.hpp
@@ -40,4 +40,8 @@ std::string GetStem(const std::string &path);
 
 void AppendPath(std::string &source, const std::string &target);
 
+std::string GetIp4OfInterface(const std::string &ifName);
+
+std::string GetHostByName(const std::string& name);
+
 } // namespace io
diff --git a/src/utils/yaml_utils.cpp b/src/utils/yaml_utils.cpp
index 625b1e789..394a9791a 100644
--- a/src/utils/yaml_utils.cpp
+++ b/src/utils/yaml_utils.cpp
@@ -8,6 +8,7 @@
 
 #include "yaml_utils.hpp"
 #include "common.hpp"
+#include "io.hpp"
 
 #include <cctype>
 #include <stdexcept>
@@ -143,11 +144,18 @@ int64_t GetInt64(const YAML::Node &node, const std::string &name, std::optional<
 
 std::string GetIp4(const YAML::Node &node, const std::string &name)
 {
-    std::string ip = GetString(node, name);
-    int version = utils::GetIpVersion(ip);
-    if (version != 4)
-        FieldError(name, "must be a valid IPv4 address");
-    return ip;
+    std::string s = GetString(node, name);
+
+    int version = utils::GetIpVersion(s);
+    if (version == 6)
+        FieldError(name, "must be a valid IPv4 address or a valid network interface with a IPv4 address");
+    if (version == 4)
+        return s;
+
+    auto ipFromIf = io::GetIp4OfInterface(s);
+    if (ipFromIf.empty())
+        FieldError(name, "must be a valid IPv4 address or a valid network interface with a IPv4 address");
+    return ipFromIf;
 }
 
 void AssertHasBool(const YAML::Node &node, const std::string &name)