Masscan: Scan the entire Internet in under 5 minutes

1. masscan

   1 66 24,661 2.7 C

   TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.

   

   A very nice and well-built tool. Excellent use of sequence numbers for stateless send/receive (SYN cookies): https://github.com/robertdavidgraham/masscan/blob/master/src... (very well-documented source too, a pleasure to read).

   I once (2016) used it to scan port 22 on the whole ipv4 (had to experiment with rate limits to not trigger alarms and get complaints forwarded by my VPS provider; the clever ip+port randomization technique helps a lot with that). Then took the ~22m (iirc) IPs which responded and ran ssh-keyscan on them to extract and analyze some ~15m ssh banners and public keys (a bunch of them broken, through debianized PRNG etc.) I think most of the scanning + extraction was done overnight, via ~13 VPS rented hourly (whole thing cost < $10, and very few complaints). Fun times :) I should write it up some time, and do it again.

2. Stream

   getstream.io featured

   Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

   

3. zmap

   2 2 5,840 7.5 C

   ZMap is a fast single packet network scanner designed for Internet-wide network surveys.

   

   If masscan is of interest to you, be sure to check out zmap [0] as well. It can scan the entire IPv4 address space in around 45 minutes.

   0: https://github.com/zmap/zmap

4. netscan

   3 1 63 0.5 Go

   Discontinued A fast TCP port scanner

   I wrote netscan years ago and still use it. It's pretty fast too: https://github.com/62726164/netscan

5. masscan_as_a_service

   4 3 29 3.5 Python

   masscan as a service

   

   Massacan is awesome. One of the usecases is to periodically scan your own servers to see if you have not accidentally opened some new ports in firewalls.

   https://github.com/bobek/masscan_as_a_service

6. zdns

   5 3 1,006 9.1 Go

   Fast DNS Lookup Library and CLI Tool

   

7. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

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