From 556dba6f296bdb0eb9f23e2aa957aadf0a27e8e2 Mon Sep 17 00:00:00 2001
From: Malin Freeborn <malinfreeborn@posteo.net>
Date: Sat, 24 May 2025 23:27:06 +0200
Subject: [PATCH] scan ports with havn

---
 networking/port_scan.md | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 networking/port_scan.md

diff --git a/networking/port_scan.md b/networking/port_scan.md
new file mode 100644
index 0000000..bb5c0d5
--- /dev/null
+++ b/networking/port_scan.md
@@ -0,0 +1,25 @@
+---
+title: "Port Scan"
+tags: [ "networking" ]
+repo: 'https://github.com/mrjackwills/havn/'
+---
+
+`havn` scans ports.
+It's not in many repos, but if you can `cargo install havn`.
+
+
+```sh
+havn -h
+havn -a
+domain=splint.rs
+havn -p 19-90 ${domain}
+```
+
+That last command doesn't work reliably, so increase the number of retries (`-r`), or decrease concurrent requests (`-c`).
+
+
+```sh
+havn -p 19-443 -r 6 ${domain}
+havn -p 1-1000 -c 500 -r 5 ${domain}
+```
+