Update 10/2021 -- Morden bootnodes for archiving purposes are available:

enode://a97fd677e1b67f2554ee36a882d100c3bbcaec241d000442dee95ab23eca8c39a6c918d5317ee5aebc433aa7329387ba936071359c768413f7cc1add531f0226@176.9.51.216:42648
enode://6559a9ebe13f04e1c5d572f278ec89072a56a064f4da189d628e4c010cfaf37deeaff81589119bd046e25fdb18a03b0ab9d63229c926f1abeb4b4717d4de73dd@88.99.70.182:42648

Clients known to support the last known config of Morden: Open Ethereum v3.2.6, Parity Ethereum v2.7.2, and Classic Geth v6.1.12; all conveniently with --chain morden. Note, that the custom, non-zero starting nonce of the Morden network does not allow you to sync the chain with Geth, Multi-Geth, or Core-Geth.

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Update 10/2019 -- Morden has been replaced by Mordor: https://github.com/eth-classic/mordor

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Morden testnet

The Morden proof-of-work testnet for Ethereum Classic.

Consensus Monitoring Dashboard: http://34.68.71.127:3000/ (ask on ETC Discord for WS_SECRET)

Atlantis Hardfork: 4_729_274

Parity Ethereum

Required version: 2.4.7+ for Atlantis testing

parity --chain morden

Geth Classic

Required version: 6.0.6+ for Atlantis testing

geth --testnet

Multi Geth

Unfortunately, Multi-Geth does not support Morden. Please use Kotti or Kensington.