diff --git a/CHANGELOG.md b/CHANGELOG.md
index b43bd8ee..d5c1dcba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 - Implement `IParsable<TSelf>` on Iban type in https://github.com/skwasjer/IbanNet/pull/138
+- Implement `BankAccountNumber` on Iban type in https://github.com/skwasjer/IbanNet/pull/394
 
 ## v6.0.0
 
diff --git a/src/IbanNet/Iban.cs b/src/IbanNet/Iban.cs
index 05ba544b..aac03f54 100644
--- a/src/IbanNet/Iban.cs
+++ b/src/IbanNet/Iban.cs
@@ -78,6 +78,27 @@ internal Iban(string iban, IbanCountry ibanCountry, bool skipNormalize = false)
     /// </summary>
     public string Bban => Extract(Country.Bban) ?? _iban.Substring(4);
 
+    /// <summary>
+    /// Gets the bank account number part of the IBAN.
+    /// </summary>
+    public string? BankAccountNumber
+    {
+        get
+        {
+            var result = Extract(Country.BankAccountNumber);
+            if (result is not null)
+            {
+                return result;
+            }
+            var bankIdentifier = BankIdentifier;
+            var branchIdentifier = BranchIdentifier;
+            if (bankIdentifier is null || branchIdentifier is null)
+            {
+                return null;
+            }
+            return Bban.Substring(bankIdentifier.Length + branchIdentifier.Length);
+        }
+    }
     /// <summary>
     /// Gets the bank identifier, or <see langword="null" /> if bank identifier cannot be extracted.
     /// </summary>
diff --git a/src/IbanNet/Registry/IbanCountry.cs b/src/IbanNet/Registry/IbanCountry.cs
index 661b972e..070c5e31 100644
--- a/src/IbanNet/Registry/IbanCountry.cs
+++ b/src/IbanNet/Registry/IbanCountry.cs
@@ -24,6 +24,8 @@ public sealed class IbanCountry
     private readonly PatternDescriptor? _bankPatternDescriptor;
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]
     private readonly PatternDescriptor? _branchPatternDescriptor;
+    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
+    private readonly PatternDescriptor? _bankAccountNumberPatternDescriptor;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="IbanCountry" /> class using specified 2 letter ISO region name.
@@ -126,6 +128,16 @@ public PatternDescriptor Branch
         init => _branchPatternDescriptor = value;
     }
 
+    /// <summary>
+    /// Gets the pattern descriptor for the bank account number identifier.
+    /// </summary>
+    [AllowNull]
+    public PatternDescriptor BankAccountNumber
+    {
+        get => _bankAccountNumberPatternDescriptor ?? NullPatternDescriptor;
+        init => _bankAccountNumberPatternDescriptor = value;
+    }
+
     /// <summary>
     /// Gets when this <see cref="IbanCountry" /> was last updated in the Iban Registry.
     /// </summary>
diff --git a/test/IbanNet.Tests/IbanTests.cs b/test/IbanNet.Tests/IbanTests.cs
index 1d69d804..882f6c3e 100644
--- a/test/IbanNet.Tests/IbanTests.cs
+++ b/test/IbanNet.Tests/IbanTests.cs
@@ -285,6 +285,7 @@ public void Given_that_patternDescriptor_exists_it_should_return_extracted_prope
 
             // Act & Assert
             iban.Bban.Should().Be(ibanCountry.Bban.Example);
+            iban.BankAccountNumber.Should().Be(ibanCountry.BankAccountNumber.Example);
             iban.BankIdentifier.Should().Be(ibanCountry.Bank.Example);
             iban.BranchIdentifier.Should().Be(ibanCountry.Branch.Example);
         }
@@ -309,6 +310,7 @@ public void Given_that_patternDescriptor_is_not_known_it_should_return_null()
 
             // Act & Assert
             iban.Bban.Should().Be(ibanCountry.Bban.Example);
+            iban.BankAccountNumber.Should().BeNull("no pattern descriptor is available");
             iban.BankIdentifier.Should().BeNull("no pattern descriptor is available");
             iban.BranchIdentifier.Should().BeNull("no pattern descriptor is available");
         }
diff --git a/test/IbanNet.Tests/Registry/IbanCountryTests.cs b/test/IbanNet.Tests/Registry/IbanCountryTests.cs
index bd9b7007..b562a4f8 100644
--- a/test/IbanNet.Tests/Registry/IbanCountryTests.cs
+++ b/test/IbanNet.Tests/Registry/IbanCountryTests.cs
@@ -45,6 +45,7 @@ public void Getters_should_return_set_properties()
         const string twoLetterIsoRegionName = "nl";
         var ibanPatternDescriptor = new PatternDescriptor(NullPattern.Instance);
         var bbanPatternDescriptor = new PatternDescriptor(NullPattern.Instance);
+        var bankAccountNumberPatternDescriptor = new PatternDescriptor(NullPattern.Instance);
         var bankPatternDescriptor = new PatternDescriptor(NullPattern.Instance);
         var branchPatternDescriptor = new PatternDescriptor(NullPattern.Instance);
         const string displayName = "name";
@@ -59,6 +60,7 @@ public void Getters_should_return_set_properties()
         {
             Iban = ibanPatternDescriptor,
             Bban = bbanPatternDescriptor,
+            BankAccountNumber = bankAccountNumberPatternDescriptor,
             Bank = bankPatternDescriptor,
             Branch = branchPatternDescriptor,
             DisplayName = displayName,
@@ -73,6 +75,7 @@ public void Getters_should_return_set_properties()
         ibanCountry.TwoLetterISORegionName.Should().Be(twoLetterIsoRegionName.ToUpper());
         ibanCountry.Iban.Should().BeSameAs(ibanPatternDescriptor);
         ibanCountry.Bank.Should().BeSameAs(bankPatternDescriptor);
+        ibanCountry.BankAccountNumber.Should().BeSameAs(bankAccountNumberPatternDescriptor);
         ibanCountry.Bban.Should().BeSameAs(bbanPatternDescriptor);
         ibanCountry.Branch.Should().BeSameAs(branchPatternDescriptor);
         ibanCountry.DisplayName.Should().Be(displayName);
diff --git a/test/IbanNet.Tests/Registry/Swift/SwiftRegistryProviderTests.cs b/test/IbanNet.Tests/Registry/Swift/SwiftRegistryProviderTests.cs
index 692e4938..f17da103 100644
--- a/test/IbanNet.Tests/Registry/Swift/SwiftRegistryProviderTests.cs
+++ b/test/IbanNet.Tests/Registry/Swift/SwiftRegistryProviderTests.cs
@@ -21,6 +21,7 @@ public void When_definitions_are_loaded_should_contain(IbanCountry expectedIbanC
         actual.Should().BeEquivalentTo(expectedIbanCountry);
         actual.Iban.Pattern.ToString().Should().Be(expectedIbanCountry.Iban.Pattern.ToString());
         actual.Bban.Pattern.ToString().Should().Be(expectedIbanCountry.Bban.Pattern.ToString());
+        actual.BankAccountNumber.Pattern.ToString().Should().Be(expectedIbanCountry.BankAccountNumber.Pattern.ToString());
         actual.Bank.Pattern.ToString().Should().Be(expectedIbanCountry.Bank.Pattern.ToString());
         actual.Branch.Pattern.ToString().Should().Be(expectedIbanCountry.Branch.Pattern.ToString());
     }