Update List-of-Network-Id.md

Author: Seulgi Kim

spec/List-of-Network-Id.md

@@ -1,5 +1,5 @@
 A network id is included in [Transaction](Transaction.md) to prevent a replay attack. Also, the first 3 characters of [CodeChain Address](CodeChain-Address.md) indicates the network id, which prevents transactions to a wrong address.
 
-* CodeChain mainnet: `0xCA` (`202` in decimal)
-* CodeChain testnet: `0xFE` (`254` in decimal)
-
+* CodeChain mainnet: `CC`
+* Corgi testnet: `WC`
+* Local test node: `TC`