diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..f03a820
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,16 @@
+{
+  "env": {
+    "es6": true,
+    "node": true,
+    "jest": true
+  },
+  "extends": [
+    "standard"
+  ],
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "indent": ["error", 2]
+  }
+}
diff --git a/.gitignore b/.gitignore
index ad46b30..3b36221 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,7 @@ typings/
 
 # next.js build output
 .next
+.idea
+*.log
+node_modules
+.DS_Store
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b33f524
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# Crawler
+
+Crawler scans the ARK network to get information about the peers in the network.
+
+## Installation
+
+`npm install`
+
+## Usage
+
+`npm start http://<ip>:<port>`
+
+For port use the p2p port, which is 4001 for Ark's mainnet.
+
+## Credits
+
+- [roks0n](https://github.com/roks0n)
+- [dmvt](https://github.com/dmvt)
+- [All Contributors](../../../../contributors)
+
+## License
+
+[MIT](LICENSE) © roks0n
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..c331ecd
--- /dev/null
+++ b/app.js
@@ -0,0 +1,46 @@
+const Crawler = require('./src/crawler')
+const { URL } = require('url')
+
+const crawler = new Crawler()
+const args = process.argv.slice(2)
+
+const report = (crawler) => {
+  const blockStats = {}
+
+  for (const item of crawler.heights) {
+    if (blockStats[item.height]) {
+      blockStats[item.height].count += 1
+      blockStats[item.height].ids[item.id] += 1
+    } else {
+      blockStats[item.height] = {}
+      blockStats[item.height].count = 1
+      blockStats[item.height].ids = {}
+      blockStats[item.height].ids[item.id] = 1
+    }
+  }
+
+  console.log(`===========================================`)
+  console.log(`Total nodes visited: ${Object.keys(crawler.nodes).length}`)
+  console.log(`Total nodes online: ${crawler.heights.length}`)
+  console.log(`------------------------------------------`)
+  console.log(`Block stats:`)
+  for (const stat in blockStats) {
+    console.log(`${blockStats[stat].count} nodes on height ${stat} with hashes:`)
+    for (const hash in blockStats[stat].ids) {
+      console.log(`  - ${hash} (${blockStats[stat].ids[hash]} nodes)`)
+    }
+  }
+  console.log(`------------------------------------------`)
+  console.log(`Finished scanning in ${new Date() - crawler.startTime}ms`)
+
+  process.exit(0)
+}
+
+let node = { ip: undefined, port: undefined }
+if (args.length === 1) {
+  const url = new URL(args[0])
+  node.ip = url.hostname
+  node.port = url.port
+}
+
+crawler.run(node).then(report)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..2990092
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1463 @@
+{
+  "name": "Crawler",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      }
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+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "acorn": {
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..9f318a7
--- /dev/null
+++ b/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "Crawler",
+  "version": "1.0.0",
+  "description": "Crawler scans the ARK network to get information about the peers in the network.",
+  "main": "app.js",
+  "scripts": {
+    "start": "node app.js",
+    "lint": "eslint ./ --fix"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/deadlock-delegate/crawler.git"
+  },
+  "engines": {
+    "node": "^8.11.2"
+  },
+  "keywords": [],
+  "author": "A(rk)-Team",
+  "license": "Apache-2.0",
+  "homepage": "https://github.com/deadlock-delegate/crawler#readme",
+  "devDependencies": {
+    "eslint": "^5.16.0",
+    "eslint-config-standard": "^12.0.0",
+    "eslint-plugin-import": "^2.17.2",
+    "eslint-plugin-node": "^9.0.1",
+    "eslint-plugin-promise": "^4.1.1",
+    "eslint-plugin-standard": "^4.0.0"
+  },
+  "dependencies": {
+    "axios": "^0.18.0",
+    "lodash": "^4.17.11"
+  }
+}
diff --git a/src/crawler.js b/src/crawler.js
new file mode 100644
index 0000000..9428bd9
--- /dev/null
+++ b/src/crawler.js
@@ -0,0 +1,208 @@
+const axios = require('axios')
+const { map } = require('lodash')
+
+class Crawler {
+  /**
+   * Initializes the internal request reactor.
+   * @method constructor
+   */
+  constructor (timeout = 5000) {
+    this._counter = 0
+    this._queue = []
+    this.timeout = timeout
+    this.headers = {}
+    setTimeout(() => { this.start() }, 100)
+  }
+
+  /**
+   * Runs a height check on the entire network connected to the
+   * initial node.
+   * @method run
+   * @param  {object}  node {ip: [address], port: [4001]}
+   * @return {Promise}
+   */
+  async run (node) {
+    this.heights = []
+    this.nodes = {}
+    this.startTime = new Date()
+
+    try {
+      await this.setNetworkConfig(node)
+      await this.fetchPeers(node)
+      await this.fetchHeights()
+      console.log('. done')
+    } catch (err) {
+      console.error(err)
+    }
+
+    return this
+  }
+
+  /**
+   * Enqueues a function to be run by the internal reactor.
+   * @method queue
+   * @param  {Function} fn Any function to be processed synchronously.
+   * @return {void}
+   */
+  queue (fn) {
+    this._queue.push(fn)
+  }
+
+  /**
+   * Primary runner for the internal reactor.
+   * @method start
+   * @return {void}
+   */
+  start () {
+    if (this._counter < 500 && this._queue.length > 0) {
+      this._counter += 1
+      setTimeout(() => { this._counter -= 1 }, 1000)
+      this._queue.shift()()
+      process.stdout.write('.')
+      this.start()
+    } else {
+      setTimeout(() => { this.start() }, 100)
+    }
+  }
+
+  async setNetworkConfig (node) {
+    const response = await axios.get(
+      `http://${node.ip}:${node.port}/config`,
+      { timeout: this.timeout }
+    )
+    this.headers = {
+      nethash: response.data.data.network.nethash,
+      version: response.data.data.network.version,
+      'API-Version': 2,
+      port: 4001
+    }
+  }
+
+  /**
+   * Walks the peer list starting with `node`
+   * @method fetchPeers
+   * @param  {object}     node {ip: [address], port: [4001]}
+   * @return {Promise}
+   */
+  fetchPeers (node) {
+    return new Promise((resolve) => {
+      if (node.ip === '127.0.0.1') {
+        // Ignore localhost
+        resolve()
+      } else {
+        this.nodes[node.ip] = 'queued'
+        this.queue(() => {
+          axios
+            .get(`http://${node.ip}:${node.port}/peer/list`, {
+              timeout: this.timeout,
+              headers: this.headers
+            })
+            .then((response) => { this.peerResponseSuccess(node, response).then(resolve) })
+            .catch((err) => { this.peerResponseError(node, err).then(resolve) })
+        })
+      }
+    })
+  }
+
+  /**
+   * Logs when a connection error occurs attempting to get the peer list of `node`
+   * @method peerResponseError
+   * @param  {object}          node {ip: [address], port: [4001]}
+   * @param  {error}           err  The error object
+   * @return {Promise}
+   */
+  async peerResponseError (node, err) {
+    this.nodes[node.ip] = 'error'
+    console.error(`\nThere was a problem getting peer list from http://${node.ip}:${node.port}`)
+    return true
+  }
+
+  /**
+   * Handles a successful(ish) peer request
+   * @method peerResponseSuccess
+   * @param  {object}            peer     {ip: [address], port: [4001]}
+   * @param  {axios response}    response response object from axios
+   * @return {Promise}
+   */
+  peerResponseSuccess (peer, response) {
+    if (response.status === 200 && response.data && response.data.peers) {
+      this.nodes[peer.ip] = peer
+
+      const promises = map(response.data.peers, (newPeer) => {
+        if (this.nodes[newPeer.ip]) {
+          return Promise.resolve()
+        } else {
+          return this.fetchPeers(newPeer)
+        }
+      })
+
+      return Promise.all(promises)
+    } else {
+      return this.peerResponseError(peer, response)
+    }
+  }
+
+  /**
+   * Scans all available peer nodes for current height
+   * @method fetchHeights
+   * @return {Promise}
+   */
+  fetchHeights () {
+    const promises = map(this.nodes, (peer, ip) => {
+      if (peer === 'error') {
+        return Promise.resolve()
+      } else if (peer === 'queued') {
+        console.log(`${ip} still queued`)
+        return Promise.resolve()
+      } else {
+        return new Promise((resolve) => {
+          this.queue(() => {
+            axios
+              .get(`http://${peer.ip}:${peer.port}/peer/height`, {
+                timeout: this.timeout,
+                headers: this.headers
+              })
+              .then((response) => { this.heightResponseSuccess(peer, response).then(resolve) })
+              .catch((err) => { this.heightResponseError(peer, err).then(resolve) })
+          })
+        })
+      }
+    })
+
+    return Promise.all(promises)
+  }
+
+  /**
+   * Logs when an error occurs fetching a node's current height
+   * @method heightResponseError
+   * @param  {object}            node {ip: [address], port: [4001]}
+   * @param  {error}             err  the error object
+   * @return {Promise}
+   */
+  async heightResponseError (node, err) {
+    console.error(`\nThere was a problem getting the current height of http://${node.ip}:${node.port}`)
+    console.error(err)
+    return true
+  }
+
+  /**
+   * Handles a successful height request
+   * @method heightResponseSuccess
+   * @param  {object}              node {ip: [address], port: [4001]}
+   * @param  {axios response}      response response object from axios
+   * @return {Promise}
+   */
+  heightResponseSuccess (node, response) {
+    if (response.status === 200 && response.data && response.data.height) {
+      this.heights.push({
+        height: response.data.height,
+        id: response.data.id
+      })
+      return Promise.resolve()
+    } else {
+      return this.heightResponseError(node, response)
+    }
+  }
+}
+
+module.exports = Crawler