diff --git a/constants/additionalChainRegistry/chainid-19966.js b/constants/additionalChainRegistry/chainid-19966.js
new file mode 100644
index 0000000000..45c83e09df
--- /dev/null
+++ b/constants/additionalChainRegistry/chainid-19966.js
@@ -0,0 +1,23 @@
+export const data = {
+  "name": "ATRNXOS Chain",
+  "chain": "ATRNXOS",
+  "rpc": [
+    "https://rpc.bas.atrnx.com",
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "ATRNXOS",
+    "symbol": "EATB",
+    "decimals": 18
+  },
+  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
+  "infoURL": "https://atrnx.org",
+  "shortName": "atrnxos",
+  "chainId": 19966,
+  "networkId": 19966,
+  "icon": "https://atrnxos.github.io/images/atrnxos-icon.png",
+  "explorers": [{
+    "name": "ATRNXOS Explorer",
+    "url": "https://explorer.bas.atrnx.com",
+  }]
+}
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