diff --git a/src/core/BUILD.gn b/src/core/BUILD.gn
index a539fda0f..40e5fddb7 100644
--- a/src/core/BUILD.gn
+++ b/src/core/BUILD.gn
@@ -594,6 +594,8 @@ openthread_core_files = [
   "net/nd_agent.hpp",
   "net/netif.cpp",
   "net/netif.hpp",
+  "net/slaac_address.cpp",
+  "net/slaac_address.hpp",
   "net/sntp_client.cpp",
   "net/sntp_client.hpp",
   "net/socket.cpp",
@@ -757,8 +759,6 @@ openthread_core_files = [
   "utils/ping_sender.hpp",
   "utils/power_calibration.cpp",
   "utils/power_calibration.hpp",
-  "utils/slaac_address.cpp",
-  "utils/slaac_address.hpp",
   "utils/srp_client_buffers.cpp",
   "utils/srp_client_buffers.hpp",
   "utils/static_counter.hpp",
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 95487475f..839214106 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -192,6 +192,7 @@ set(COMMON_SOURCES
     net/nd6.cpp
     net/nd_agent.cpp
     net/netif.cpp
+    net/slaac_address.cpp
     net/sntp_client.cpp
     net/socket.cpp
     net/srp_advertising_proxy.cpp
@@ -274,7 +275,6 @@ set(COMMON_SOURCES
     utils/parse_cmdline.cpp
     utils/ping_sender.cpp
     utils/power_calibration.cpp
-    utils/slaac_address.cpp
     utils/srp_client_buffers.cpp
     utils/verhoeff_checksum.cpp
 )
diff --git a/src/core/api/ip6_api.cpp b/src/core/api/ip6_api.cpp
index 5ed41d107..4ad0fda39 100644
--- a/src/core/api/ip6_api.cpp
+++ b/src/core/api/ip6_api.cpp
@@ -241,7 +241,7 @@ otError otIp6RegisterMulticastListeners(otInstance                             *
 
 #if OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
 
-bool otIp6IsSlaacEnabled(otInstance *aInstance) { return AsCoreType(aInstance).Get<Utils::Slaac>().IsEnabled(); }
+bool otIp6IsSlaacEnabled(otInstance *aInstance) { return AsCoreType(aInstance).Get<Ip6::Slaac>().IsEnabled(); }
 
 void otIp6SetSlaacEnabled(otInstance *aInstance, bool aEnabled)
 {
@@ -249,17 +249,17 @@ void otIp6SetSlaacEnabled(otInstance *aInstance, bool aEnabled)
 
     if (aEnabled)
     {
-        instance.Get<Utils::Slaac>().Enable();
+        instance.Get<Ip6::Slaac>().Enable();
     }
     else
     {
-        instance.Get<Utils::Slaac>().Disable();
+        instance.Get<Ip6::Slaac>().Disable();
     }
 }
 
 void otIp6SetSlaacPrefixFilter(otInstance *aInstance, otIp6SlaacPrefixFilter aFilter)
 {
-    AsCoreType(aInstance).Get<Utils::Slaac>().SetFilter(aFilter);
+    AsCoreType(aInstance).Get<Ip6::Slaac>().SetFilter(aFilter);
 }
 
 #endif // OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
diff --git a/src/core/common/notifier.cpp b/src/core/common/notifier.cpp
index 949628fe5..eda668878 100644
--- a/src/core/common/notifier.cpp
+++ b/src/core/common/notifier.cpp
@@ -146,7 +146,7 @@ void Notifier::EmitEvents(void)
     Get<TimeSync>().HandleNotifierEvents(events);
 #endif
 #if OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
-    Get<Utils::Slaac>().HandleNotifierEvents(events);
+    Get<Ip6::Slaac>().HandleNotifierEvents(events);
 #endif
 #if OPENTHREAD_CONFIG_JAM_DETECTION_ENABLE
     Get<Utils::JamDetector>().HandleNotifierEvents(events);
diff --git a/src/core/common/settings.hpp b/src/core/common/settings.hpp
index 32226092b..27836ae0b 100644
--- a/src/core/common/settings.hpp
+++ b/src/core/common/settings.hpp
@@ -50,9 +50,9 @@
 #include "meshcop/border_agent.hpp"
 #include "meshcop/dataset.hpp"
 #include "net/ip6_address.hpp"
+#include "net/slaac_address.hpp"
 #include "thread/version.hpp"
 #include "utils/flash.hpp"
-#include "utils/slaac_address.hpp"
 
 namespace ot {
 
@@ -479,7 +479,7 @@ public:
     public:
         static constexpr Key kKey = kKeySlaacIidSecretKey; ///< The associated key.
 
-        typedef Utils::Slaac::IidSecretKey ValueType; ///< The associated value type.
+        typedef Ip6::Slaac::IidSecretKey ValueType; ///< The associated value type.
 
     private:
         SlaacIidSecretKey(void) = default;
diff --git a/src/core/instance/instance.hpp b/src/core/instance/instance.hpp
index 858a45ead..6fe983e55 100644
--- a/src/core/instance/instance.hpp
+++ b/src/core/instance/instance.hpp
@@ -105,6 +105,7 @@
 #include "net/nat64_translator.hpp"
 #include "net/nd_agent.hpp"
 #include "net/netif.hpp"
+#include "net/slaac_address.hpp"
 #include "net/sntp_client.hpp"
 #include "net/srp_advertising_proxy.hpp"
 #include "net/srp_client.hpp"
@@ -143,7 +144,6 @@
 #include "utils/link_metrics_manager.hpp"
 #include "utils/mesh_diag.hpp"
 #include "utils/ping_sender.hpp"
-#include "utils/slaac_address.hpp"
 #include "utils/srp_client_buffers.hpp"
 #endif // OPENTHREAD_FTD || OPENTHREAD_MTD
 
@@ -511,7 +511,7 @@ private:
 #endif
 
 #if OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
-    Utils::Slaac mSlaac;
+    Ip6::Slaac mSlaac;
 #endif
 
 #if OPENTHREAD_CONFIG_DNS_CLIENT_ENABLE
@@ -967,7 +967,7 @@ template <> inline NeighborDiscovery::Agent &Instance::Get(void) { return mNeigh
 #endif
 
 #if OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
-template <> inline Utils::Slaac &Instance::Get(void) { return mSlaac; }
+template <> inline Ip6::Slaac &Instance::Get(void) { return mSlaac; }
 #endif
 
 #if OPENTHREAD_CONFIG_JAM_DETECTION_ENABLE
diff --git a/src/core/net/ip6.hpp b/src/core/net/ip6.hpp
index 80130b36a..e7a76d10c 100644
--- a/src/core/net/ip6.hpp
+++ b/src/core/net/ip6.hpp
@@ -85,6 +85,7 @@ namespace Ip6 {
  * @defgroup core-ip6-ip6 IPv6
  * @defgroup core-ip6-mpl MPL
  * @defgroup core-ip6-netif Network Interfaces
+ * @defgroup core-ip6-slaac SLAAC
  *
  * @}
  */
diff --git a/src/core/utils/slaac_address.cpp b/src/core/net/slaac_address.cpp
similarity index 95%
rename from src/core/utils/slaac_address.cpp
rename to src/core/net/slaac_address.cpp
index 83ccfa49f..f5c11a024 100644
--- a/src/core/utils/slaac_address.cpp
+++ b/src/core/net/slaac_address.cpp
@@ -39,7 +39,7 @@
 #include "instance/instance.hpp"
 
 namespace ot {
-namespace Utils {
+namespace Ip6 {
 
 RegisterLogModule("Slaac");
 
@@ -94,7 +94,7 @@ exit:
     return;
 }
 
-Error Slaac::FindDomainIdFor(const Ip6::Address &aAddress, uint8_t &aDomainId) const
+Error Slaac::FindDomainIdFor(const Address &aAddress, uint8_t &aDomainId) const
 {
     Error error = kErrorNotFound;
 
@@ -105,7 +105,7 @@ Error Slaac::FindDomainIdFor(const Ip6::Address &aAddress, uint8_t &aDomainId) c
             continue;
         }
 
-        if (aAddress.PrefixMatch(slaacAddr.GetAddress()) >= Ip6::NetworkPrefix::kLength)
+        if (aAddress.PrefixMatch(slaacAddr.GetAddress()) >= NetworkPrefix::kLength)
         {
             aDomainId = slaacAddr.GetDomainId();
             error     = kErrorNone;
@@ -118,7 +118,7 @@ Error Slaac::FindDomainIdFor(const Ip6::Address &aAddress, uint8_t &aDomainId) c
 
 bool Slaac::IsSlaac(const NetworkData::OnMeshPrefixConfig &aConfig) const
 {
-    return aConfig.mSlaac && !aConfig.mDp && (aConfig.GetPrefix().GetLength() == Ip6::NetworkPrefix::kLength);
+    return aConfig.mSlaac && !aConfig.mDp && (aConfig.GetPrefix().GetLength() == NetworkPrefix::kLength);
 }
 
 bool Slaac::IsFiltered(const NetworkData::OnMeshPrefixConfig &aConfig) const
@@ -155,8 +155,7 @@ exit:
     return;
 }
 
-bool Slaac::DoesConfigMatchNetifAddr(const NetworkData::OnMeshPrefixConfig &aConfig,
-                                     const Ip6::Netif::UnicastAddress      &aAddr)
+bool Slaac::DoesConfigMatchNetifAddr(const NetworkData::OnMeshPrefixConfig &aConfig, const Netif::UnicastAddress &aAddr)
 {
     return (((aConfig.mOnMesh && (aAddr.mPrefixLength == aConfig.mPrefix.mLength)) ||
              (!aConfig.mOnMesh && (aAddr.mPrefixLength == 128))) &&
@@ -287,7 +286,7 @@ void Slaac::AddAddresses(void)
             continue;
         }
 
-        for (const Ip6::Netif::UnicastAddress &netifAddr : Get<ThreadNetif>().GetUnicastAddresses())
+        for (const Netif::UnicastAddress &netifAddr : Get<ThreadNetif>().GetUnicastAddresses())
         {
             if (DoesConfigMatchNetifAddr(prefixConfig, netifAddr))
             {
@@ -403,7 +402,7 @@ void Slaac::HandleTimer(void)
     mTimer.FireAtIfEarlier(nextTime);
 }
 
-Error Slaac::GenerateIid(Ip6::Netif::UnicastAddress &aAddress, uint8_t &aDadCounter) const
+Error Slaac::GenerateIid(Netif::UnicastAddress &aAddress, uint8_t &aDadCounter) const
 {
     /*
      *  This method generates a semantically opaque IID per RFC 7217.
@@ -425,7 +424,7 @@ Error Slaac::GenerateIid(Ip6::Netif::UnicastAddress &aAddress, uint8_t &aDadCoun
     Crypto::Sha256       sha256;
     Crypto::Sha256::Hash hash;
 
-    static_assert(sizeof(hash) >= Ip6::InterfaceIdentifier::kSize,
+    static_assert(sizeof(hash) >= InterfaceIdentifier::kSize,
                   "SHA-256 hash size is too small to use as IPv6 address IID");
 
     GetIidSecretKey(secretKey);
@@ -506,7 +505,7 @@ exit:
     return;
 }
 
-} // namespace Utils
+} // namespace Ip6
 } // namespace ot
 
 #endif // OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
diff --git a/src/core/utils/slaac_address.hpp b/src/core/net/slaac_address.hpp
similarity index 95%
rename from src/core/utils/slaac_address.hpp
rename to src/core/net/slaac_address.hpp
index 87a99b75a..e825c00ff 100644
--- a/src/core/utils/slaac_address.hpp
+++ b/src/core/net/slaac_address.hpp
@@ -45,10 +45,10 @@
 #include "thread/network_data.hpp"
 
 namespace ot {
-namespace Utils {
+namespace Ip6 {
 
 /**
- * @addtogroup core-slaac-address
+ * @addtogroup core-ip6-slaac
  *
  * @brief
  *   This module includes definitions for Thread global IPv6 address configuration with SLAAC.
@@ -132,7 +132,7 @@ public:
      * @retval kErrorNone    If successfully generated the IID.
      * @retval kErrorFailed  If no valid IID was generated.
      */
-    Error GenerateIid(Ip6::Netif::UnicastAddress &aAddress, uint8_t &aDadCounter) const;
+    Error GenerateIid(Netif::UnicastAddress &aAddress, uint8_t &aDadCounter) const;
 
     /**
      * Searches in the list of deprecating SLAAC prefixes for a match to a given address and if found, returns the
@@ -148,7 +148,7 @@ public:
      * @retval kErrorNone       Found a match for @p aAddress and updated @p aDomainId.
      * @retval kErrorNotFound   Could not find a match for @p aAddress in deprecating SLAAC prefixes.
      */
-    Error FindDomainIdFor(const Ip6::Address &aAddress, uint8_t &aDomainId) const;
+    Error FindDomainIdFor(const Address &aAddress, uint8_t &aDomainId) const;
 
 private:
     static constexpr uint16_t kNumSlaacAddresses = OPENTHREAD_CONFIG_IP6_SLAAC_NUM_ADDRESSES;
@@ -165,7 +165,7 @@ private:
         kDeprecating,
     };
 
-    class SlaacAddress : public Ip6::Netif::UnicastAddress
+    class SlaacAddress : public Netif::UnicastAddress
     {
     public:
         static constexpr uint8_t kInvalidContextId = 0;
@@ -211,7 +211,7 @@ private:
     void        HandleNotifierEvents(Events aEvents);
     void        LogAddress(Action aAction, const SlaacAddress &aAddress);
     static bool DoesConfigMatchNetifAddr(const NetworkData::OnMeshPrefixConfig &aConfig,
-                                         const Ip6::Netif::UnicastAddress      &aAddr);
+                                         const Netif::UnicastAddress           &aAddr);
 
     using ExpireTimer = TimerMilliIn<Slaac, &Slaac::HandleTimer>;
 
@@ -225,7 +225,7 @@ private:
  * @}
  */
 
-} // namespace Utils
+} // namespace Ip6
 } // namespace ot
 
 #endif // OPENTHREAD_CONFIG_IP6_SLAAC_ENABLE
diff --git a/src/core/thread/dua_manager.cpp b/src/core/thread/dua_manager.cpp
index 5904e5b53..16a9d5c27 100644
--- a/src/core/thread/dua_manager.cpp
+++ b/src/core/thread/dua_manager.cpp
@@ -135,7 +135,7 @@ Error DuaManager::GenerateDomainUnicastAddressIid(void)
     Error   error;
     uint8_t dadCounter = mDadCounter;
 
-    if ((error = Get<Utils::Slaac>().GenerateIid(mDomainUnicastAddress, dadCounter)) == kErrorNone)
+    if ((error = Get<Ip6::Slaac>().GenerateIid(mDomainUnicastAddress, dadCounter)) == kErrorNone)
     {
         if (dadCounter != mDadCounter)
         {
diff --git a/src/core/thread/network_data_leader.cpp b/src/core/thread/network_data_leader.cpp
index 51f666c4f..3f82d8f6e 100644
--- a/src/core/thread/network_data_leader.cpp
+++ b/src/core/thread/network_data_leader.cpp
@@ -288,7 +288,7 @@ Error Leader::RouteLookup(const Ip6::Address &aSource, const Ip6::Address &aDest
 
         uint8_t domainId;
 
-        if (Get<Utils::Slaac>().FindDomainIdFor(aSource, domainId) == kErrorNone)
+        if (Get<Ip6::Slaac>().FindDomainIdFor(aSource, domainId) == kErrorNone)
         {
             error = ExternalRouteLookup(domainId, aDestination, aRloc16);
         }