diff --git a/crates/blockifier_reexecution/src/main.rs b/crates/blockifier_reexecution/src/main.rs
index 261994643d6..f94d9bcc1f0 100644
--- a/crates/blockifier_reexecution/src/main.rs
+++ b/crates/blockifier_reexecution/src/main.rs
@@ -11,6 +11,7 @@ use blockifier_reexecution::state_reader::utils::{
 };
 use clap::{Args, Parser, Subcommand};
 use starknet_api::block::BlockNumber;
+use starknet_api::core::ChainId;
 use starknet_gateway::config::RpcStateReaderConfig;
 
 /// BlockifierReexecution CLI.
@@ -24,13 +25,49 @@ pub struct BlockifierReexecutionCliArgs {
     command: Command,
 }
 
+#[derive(clap::ValueEnum, Clone, Debug)]
+enum SupportedChainId {
+    Mainnet,
+    Testnet,
+    Integration,
+}
+
+impl From<SupportedChainId> for ChainId {
+    fn from(chain_id: SupportedChainId) -> Self {
+        match chain_id {
+            SupportedChainId::Mainnet => Self::Mainnet,
+            SupportedChainId::Testnet => Self::Sepolia,
+            SupportedChainId::Integration => Self::IntegrationSepolia,
+        }
+    }
+}
+
+#[derive(Debug, Args)]
+struct RpcArgs {
+    /// Node url.
+    #[clap(long, short = 'n')]
+    node_url: String,
+
+    /// Optional chain ID (if not provided, it will be guessed from the node url).
+    #[clap(long, short = 'c')]
+    chain_id: Option<SupportedChainId>,
+}
+
+impl RpcArgs {
+    pub(crate) fn parse_chain_id(&self) -> ChainId {
+        self.chain_id
+            .clone()
+            .map(ChainId::from)
+            .unwrap_or(guess_chain_id_from_node_url(self.node_url.as_str()).unwrap())
+    }
+}
+
 #[derive(Debug, Subcommand)]
 enum Command {
     /// Runs the RPC test.
     RpcTest {
-        /// Node url.
-        #[clap(long, short = 'n')]
-        node_url: String,
+        #[clap(flatten)]
+        rpc_args: RpcArgs,
 
         /// Block number.
         #[clap(long, short = 'b')]
@@ -39,9 +76,8 @@ enum Command {
 
     /// Writes the RPC queries to json files.
     WriteRpcRepliesToJson {
-        /// Node url.
-        #[clap(long, short = 'n')]
-        node_url: String,
+        #[clap(flatten)]
+        rpc_args: RpcArgs,
 
         /// Block number.
         #[clap(long, short = 'b')]
@@ -76,18 +112,21 @@ fn main() {
     let args = BlockifierReexecutionCliArgs::parse();
 
     match args.command {
-        Command::RpcTest { node_url, block_number } => {
-            println!("Running RPC test for block number {block_number} using node url {node_url}.",);
+        Command::RpcTest { block_number, rpc_args } => {
+            println!(
+                "Running RPC test for block number {block_number} using node url {}.",
+                rpc_args.node_url
+            );
 
             let config = RpcStateReaderConfig {
-                url: node_url.clone(),
+                url: rpc_args.node_url.clone(),
                 json_rpc_version: JSON_RPC_VERSION.to_string(),
             };
 
             reexecute_and_verify_correctness(ConsecutiveTestStateReaders::new(
                 BlockNumber(block_number - 1),
                 Some(config),
-                guess_chain_id_from_node_url(node_url.as_str()).unwrap(),
+                rpc_args.parse_chain_id(),
                 false,
             ));
 
@@ -96,16 +135,16 @@ fn main() {
             println!("RPC test passed successfully.");
         }
 
-        Command::WriteRpcRepliesToJson { node_url, block_number, full_file_path } => {
+        Command::WriteRpcRepliesToJson { block_number, full_file_path, rpc_args } => {
             let full_file_path = full_file_path.unwrap_or(format!(
                 "./crates/blockifier_reexecution/resources/block_{block_number}/reexecution_data.\
                  json"
             ));
-            let chain_id = guess_chain_id_from_node_url(node_url.as_str()).unwrap();
+            let chain_id = rpc_args.parse_chain_id();
 
             // TODO(Aner): refactor to reduce code duplication.
             let config = RpcStateReaderConfig {
-                url: node_url,
+                url: rpc_args.node_url,
                 json_rpc_version: JSON_RPC_VERSION.to_string(),
             };