Masscan: Scan the entire Internet in under 5 minutes

• masscan

  64 22,637 7.8 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.

• zmap

  1 5,256 8.9 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

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• netscan

  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

• masscan_as_a_service

  3 22 0.0 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

• zdns

  3 851 5.7 Go

  Fast CLI DNS Lookup Tool

  

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

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