diff --git a/constants/additionalChainRegistry/chainid-99991.js b/constants/additionalChainRegistry/chainid-99991.js
new file mode 100644
index 0000000000..012c57d732
--- /dev/null
+++ b/constants/additionalChainRegistry/chainid-99991.js
@@ -0,0 +1,25 @@
+export const data = {
+  "name": "Quantum Sharded Network Testnet",
+  "chain": "QSN",
+  "rpc": [
+    "https://node.qsnchain.com/testnet/"
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Quantum Sharded Network",
+    "symbol": "tQSN",
+    "decimals": 18
+  },
+  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
+  "infoURL": "https://qsnchain.com",
+  "shortName": "qsn",
+  "chainId": 99991,
+  "networkId": 99991,
+  "icon": "qsn",
+  "explorers": [{
+    "name": "QSN Explorer",
+    "url": "https://qsnscan.io",
+    "icon": "qsn",
+    "standard": "EIP3091"
+  }]
+}