# Connect to a network

Filecoin has several networks for various testing, benchmarking, and optimization needs. This page describes the available networks, their key characteristics, and usage instructions.

Network Purpose Sector Sizes Stability
Testnet Evaluate Filecoin at a meaningful scale. 32GiB, 64GiB High
Calibration Devnet For miners to prepare for the Space Race (recommended for most miners) 512MiB, 32GiB, 64GiB Moderate
Nerpa Devnet For developers building apps, with small sector sizes and reduced proofs parameters. Sealing time is ~15-20 minutes. (recommended for most developers) 512MiB Moderate
Walrus Devnet For developers testing large storage deals only 32GiB, 64GiB High
Butterfly Devnet For core implementers testing new code. (frequent resets and not recommended for most users) 512MiB, 32GiB, 64GiB Low

# Connection Instructions

To connect to any of these networks:

  1. Choose the network that best suits your needs. As of July 22, we recommend calibration for most miners and nerpa for most developers.
  2. Delete any existing local Lotus repository, if one is present.
  3. Build Lotus from the branch and tag listed for each network (example: ntwk-nerpa, tag ntwk-nerpa-7.7.0).
  4. When you run lotus daemon on the build you've created from the listed branch, you should automatically be connected to the proper bootstrap nodes.
  5. Storage developers: There should be a few dedicated storage miners on each devnet that are configured to accept storage deals. While there are currently no uptime guarantees on these auto-accepting miners, if you are having trouble finding a miner to accept your storage deal, please ping the Filecoin Slack channel listed in each network's details section.

# Testnet

Testnet is the primary live testing network before Mainnet launch. Here, we evaluate Filecoin at meaningful scale via testing, benchmarking, and optimizations.

Testnet is the most realistic simulation of the Filecoin mainnet to date:

  • Prospective storage miners can experience more realistic sealing performance and hardware requirements due to the use of near-final proofs constructions and parameters
  • Prospective storage clients can store and retrieve real data on the testnet. Clients can participate in deal-making workflows and storage + retrieval functionality.
  • As planned for mainnet, the minimum sector size on testnet is 32 GB. and 64 GB sectors are also available.

Testnet is the network of record for the Filecoin Space Race, a 3-week incentivized mining competition taking place in August 2020.

# Testnet Details

Description Details
Sector Sizes 32GiB, 64GiB
Branch master
Tag n/a
Next expected reset Aug 3, 2020

# Testnet Resources

Description Details
Faucet https://faucet.testnet.filecoin.io/
Stats dashboard https://stats.testnet.filecoin.io/
Block explorers Filscan
Filscout
Filplorer
1475 Explorer
Filfox
Slack channel #fil-testnet

# Devnets

Several developer networks (also called devnets) are available with various configurations and performance characteristics. The recommended networks for most users are calibration (for miners) and nerpa (for developers).

# Calibration Devnet

Calibration is an up-to-date devnet, best for miners preparing for the Space Race mining competition. Miners can practice in real competition conditions and see how their performance influences hypothetical competition standings.

# Calibration Devnet Details

Description Details
Sector Sizes 512MiB, 32GiB, 64GiB
Branch ntwk-calibration
Tag ntwk-calibration-8.1.0
Details page calibration.fildev.network
Next expected reset July 31, 2020, with frequent resets through Aug 3. See Slack channels below for reset announcements.

# Calibration Devnet Resources

Description Details
Faucet https://faucet.calibration.fildev.network/
Stats dashboard https://stats.calibration.fildev.network/
Block explorers https://calibration.filfox.io/
https://calibration.filscan.io/
Slack channels #fil-net-calibration
#space-race

# Nerpa Devnet

Nerpa is a long-lived devnet, best for developers building storage apps. Nerpa uses small sectors and reduced proofs parameters, so sealing is much faster than in the full Testnet version. The name comes from a species of seal, one of the smallest true seals.

# Nerpa Devnet Details

Description Details
Sector Sizes 512MiB
Branch ntwk-nerpa
Tag tag ntwk-nerpa-7.7.0
Details page nerpa.fildev.network
Next expected reset July 23, 2020

# Nerpa Devnet Resources

Description Details
Faucet https://faucet.nerpa.fildev.network/
Stats dashboard https://stats.nerpa.fildev.network/
Block explorers n/a
Slack channel #fil-net-nerpa

# Walrus Devnet

Walrus is a long-running devnet featuring large sector sizes and higher stability, but sometimes out-of-date code. Resets are only performed with plenty of notice to active users. Usage is only recommended if you are a storage developer testing large-scale deals.

Details coming soon.

# Butterfly Devnet

Butterfly is a devnet that features the absolute latest changes, and is considered unstable. Usage is not recommended unless you are actively developing or investigating bugs in the core implementations.

# Butterfly Devnet Details

Description Details
Sector Sizes 512MiB, 32GiB, 64GiB
Branch ntwk-butterfly
Tag ntwk-butterfly-7.20.0
Details page butterfly.fildev.network
Next expected reset July 23, 2020, with very frequent resets and limited notice.

# Butterfly Devnet Resources

Description Details
Faucet https://faucet.butterfly.fildev.network/
Stats dashboard https://stats.butterfly.fildev.network/
Block explorers n/a
Slack channel #fil-net-butterfly