diff --git a/zcash_client_backend/src/constants.rs b/zcash_client_backend/src/constants.rs
index ee858a1..28f0b2c 100644
--- a/zcash_client_backend/src/constants.rs
+++ b/zcash_client_backend/src/constants.rs
@@ -2,6 +2,7 @@
 
 pub mod mainnet;
 pub mod testnet;
+pub mod regtest;
 
 pub const SPROUT_CONSENSUS_BRANCH_ID: u32 = 0;
 pub const OVERWINTER_CONSENSUS_BRANCH_ID: u32 = 0x5ba8_1b19;
diff --git a/zcash_client_backend/src/constants/regtest.rs b/zcash_client_backend/src/constants/regtest.rs
new file mode 100644
index 0000000..962101f
--- /dev/null
+++ b/zcash_client_backend/src/constants/regtest.rs
@@ -0,0 +1,38 @@
+/// The testnet coin type for ZEC, as defined by [SLIP 44].
+///
+/// [SLIP 44]: https://github.com/satoshilabs/slips/blob/master/slip-0044.md
+pub const COIN_TYPE: u32 = 1;
+
+/// The HRP for a Bech32-encoded testnet [`ExtendedSpendingKey`].
+///
+/// Defined in [ZIP 32].
+///
+/// [`ExtendedSpendingKey`]: zcash_primitives::zip32::ExtendedSpendingKey
+/// [ZIP 32]: https://github.com/zcash/zips/blob/master/zip-0032.rst
+pub const HRP_SAPLING_EXTENDED_SPENDING_KEY: &str = "secret-extended-key-regtest";
+
+/// The HRP for a Bech32-encoded testnet [`ExtendedFullViewingKey`].
+///
+/// Defined in [ZIP 32].
+///
+/// [`ExtendedFullViewingKey`]: zcash_primitives::zip32::ExtendedFullViewingKey
+/// [ZIP 32]: https://github.com/zcash/zips/blob/master/zip-0032.rst
+pub const HRP_SAPLING_EXTENDED_FULL_VIEWING_KEY: &str = "zxviewregtestsapling";
+
+/// The HRP for a Bech32-encoded testnet [`PaymentAddress`].
+///
+/// Defined in section 5.6.4 of the [Zcash Protocol Specification].
+///
+/// [`PaymentAddress`]: sapling_crypto::primitives::PaymentAddress
+/// [Zcash Protocol Specification]: https://github.com/zcash/zips/blob/master/protocol/protocol.pdf
+pub const HRP_SAPLING_PAYMENT_ADDRESS: &str = "zregtestsapling";
+
+/// The prefix for a Base58Check-encoded testnet [`TransparentAddress::PublicKey`].
+///
+/// [`TransparentAddress::PublicKey`]: zcash_primitives::legacy::TransparentAddress::PublicKey
+pub const B58_PUBKEY_ADDRESS_PREFIX: [u8; 2] = [0x1d, 0x25];
+
+/// The prefix for a Base58Check-encoded testnet [`TransparentAddress::Script`].
+///
+/// [`TransparentAddress::Script`]: zcash_primitives::legacy::TransparentAddress::Script
+pub const B58_SCRIPT_ADDRESS_PREFIX: [u8; 2] = [0x1c, 0xba];