diff --git a/pkgs/params/CHANGELOG.md b/pkgs/params/CHANGELOG.md
index 6147e62f0..23f708cb1 100644
--- a/pkgs/params/CHANGELOG.md
+++ b/pkgs/params/CHANGELOG.md
@@ -12,6 +12,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 ### Added
 
 - `BRR_PERIODS_PERMILLE`, the masternode share of the block value in each block reward reallocation period.
+- **`BuriedDeployment::Ipv4Optional` and `ConsensusParams::ipv4_optional_height`**, from which masternode primary
+  addresses need not be IPv4. As in the reference implementation v24.0.0, the height is 0 on testnet and not scheduled
+  (`ConsensusParams::NOT_SCHEDULED`) on mainnet and regtest.
 
 ### Changed
 
diff --git a/pkgs/params/corpus/chainparams.json5 b/pkgs/params/corpus/chainparams.json5
index f3a92479d..b69be36f0 100644
--- a/pkgs/params/corpus/chainparams.json5
+++ b/pkgs/params/corpus/chainparams.json5
@@ -1,6 +1,6 @@
 //
 // Chain parameter vectors. Generated with the reference implementation
-// (dashpay/dash v24.0.0-rc.5, 8163290aa0).
+// (dashpay/dash v24.0.0, 938fba5028).
 //
 // Each entry is the output of the command above it, keyed by chain. The node
 // of each chain runs with an empty data directory and no connections, so it
diff --git a/pkgs/params/src/consensus.rs b/pkgs/params/src/consensus.rs
index 36ef5017b..83664b7ae 100644
--- a/pkgs/params/src/consensus.rs
+++ b/pkgs/params/src/consensus.rs
@@ -61,6 +61,8 @@ pub enum BuriedDeployment {
   MnRr,
   /// Credit withdrawal transactions.
   Withdrawals,
+  /// Masternode primary addresses need not be IPv4.
+  Ipv4Optional,
 }
 
 /// Parameters that influence chain consensus.
@@ -142,6 +144,8 @@ pub struct ConsensusParams {
   pub mn_rr_height: BlockHeight,
   /// Credit withdrawal activation height.
   pub withdrawals_height: BlockHeight,
+  /// Height from which masternode primary addresses need not be IPv4.
+  pub ipv4_optional_height: BlockHeight,
   /// Minimum height before BIP9 warning triggers.
   pub min_bip9_warning_height: BlockHeight,
   /// Threshold of blocks in a window that must
@@ -188,6 +192,9 @@ pub struct ConsensusParams {
 }
 
 impl ConsensusParams {
+  /// Activation height of a buried deployment that is not scheduled.
+  pub const NOT_SCHEDULED: BlockHeight = BlockHeight::from_u32(i32::MAX.unsigned_abs());
+
   /// Returns the activation height for a buried deployment.
   pub const fn deployment_height(&self, dep: BuriedDeployment) -> BlockHeight {
     match dep {
@@ -206,6 +213,7 @@ impl ConsensusParams {
       BuriedDeployment::V20 => self.v20_height,
       BuriedDeployment::MnRr => self.mn_rr_height,
       BuriedDeployment::Withdrawals => self.withdrawals_height,
+      BuriedDeployment::Ipv4Optional => self.ipv4_optional_height,
     }
   }
 
diff --git a/pkgs/params/src/params/mainnet.rs b/pkgs/params/src/params/mainnet.rs
index f756c5e32..54f1b505d 100644
--- a/pkgs/params/src/params/mainnet.rs
+++ b/pkgs/params/src/params/mainnet.rs
@@ -59,6 +59,7 @@ pub static PARAMS: ChainParams = ChainParams {
     v20_height: BlockHeight::from_u32(1_987_776),
     mn_rr_height: BlockHeight::from_u32(2_128_896),
     withdrawals_height: BlockHeight::from_u32(2_201_472),
+    ipv4_optional_height: ConsensusParams::NOT_SCHEDULED,
     min_bip9_warning_height: BlockHeight::from_u32(2_201_472 + 2016),
     rule_change_activation_threshold: 1815, // 90% of 2016
     miner_confirmation_window: 2016,
diff --git a/pkgs/params/src/params/regtest.rs b/pkgs/params/src/params/regtest.rs
index 50dc79e73..a027a9992 100644
--- a/pkgs/params/src/params/regtest.rs
+++ b/pkgs/params/src/params/regtest.rs
@@ -51,6 +51,7 @@ pub static PARAMS: ChainParams = ChainParams {
     v20_height: BlockHeight::from_u32(432),   // equals dip0003_height
     mn_rr_height: BlockHeight::from_u32(432), // equals v20_height
     withdrawals_height: BlockHeight::from_u32(600),
+    ipv4_optional_height: ConsensusParams::NOT_SCHEDULED,
     min_bip9_warning_height: BlockHeight::from_u32(0),
     rule_change_activation_threshold: 108, // 75% of 144
     miner_confirmation_window: 144,
diff --git a/pkgs/params/src/params/test3.rs b/pkgs/params/src/params/test3.rs
index 89afe413e..b9815e4e5 100644
--- a/pkgs/params/src/params/test3.rs
+++ b/pkgs/params/src/params/test3.rs
@@ -57,6 +57,7 @@ pub static PARAMS: ChainParams = ChainParams {
     v20_height: BlockHeight::from_u32(905_100),
     mn_rr_height: BlockHeight::from_u32(1_066_900),
     withdrawals_height: BlockHeight::from_u32(1_148_500),
+    ipv4_optional_height: BlockHeight::from_u32(0),
     min_bip9_warning_height: BlockHeight::from_u32(1_148_500 + 2016),
     rule_change_activation_threshold: 1512, // 75% for testchains
     miner_confirmation_window: 2016,
diff --git a/pkgs/params/tests/corpus.rs b/pkgs/params/tests/corpus.rs
index 928135ec7..301705240 100644
--- a/pkgs/params/tests/corpus.rs
+++ b/pkgs/params/tests/corpus.rs
@@ -62,7 +62,7 @@ struct Bip9 {
 }
 
 /// The buried deployments under the names `getdeploymentinfo` reports them
-/// under.
+/// under. It does not report [`BuriedDeployment::Ipv4Optional`].
 const BURIED: [(&str, BuriedDeployment); 15] = [
   ("bip34", BuriedDeployment::HeightInCoinbase),
   ("bip66", BuriedDeployment::DerSig),
@@ -148,6 +148,21 @@ fn deployments_match_vectors(#[case] network: Network) {
   assert_eq!(infos.get(chain.network_id), Some(&DeploymentInfo::from(chain)));
 }
 
+/// The `ipv4_optional` height is 0 on testnet and not scheduled (`i32::MAX`)
+/// on mainnet and regtest.
+#[rstest]
+#[case::mainnet(Network::Main, 2_147_483_647)]
+#[case::testnet(Network::Testnet3, 0)]
+#[case::regtest(Network::Regtest, 2_147_483_647)]
+fn ipv4_optional_heights(#[case] network: Network, #[case] height: u32) {
+  let consensus = network.consensus();
+  assert_eq!(consensus.ipv4_optional_height.to_u32(), height);
+  assert_eq!(
+    consensus.deployment_height(BuriedDeployment::Ipv4Optional).to_u32(),
+    height
+  );
+}
+
 #[rstest]
 #[case::mainnet(Network::Main)]
 #[case::testnet(Network::Testnet3)]