Hacker News: JulianHart

New comment by JulianHart in "Agent Skills"

JulianHart — Tue, 03 Feb 2026 15:20:36 +0000

Interesting format, but skills feel like optimizing the wrong layer. The agents usually don't fail because of bad instructions — they fail because external systems treat them like bots.

You can have the perfect scraping skill, but if the target blocks your requests, you're stuck. The hard problems are downstream.

New comment by JulianHart in "IP Addresses Through 2025"

JulianHart — Tue, 20 Jan 2026 19:41:55 +0000

The CGNAT point is underrated. Carriers have zero incentive to move away from it - thousands of users per public IP, no transition cost.

The interesting downstream effect is on IP reputation systems. Traditional detection assumed 1 IP = 1 user. CGNAT breaks that entirely - platforms can't aggressively filter mobile carrier IPs without blocking legitimate customers by the thousands.

Makes sense the IPv4 price dropped once mobile networks proved you can serve massive user bases with relatively few public addresses.

New comment by JulianHart in "A decentralized peer-to-peer messaging application that operates over Bluetooth"

JulianHart — Mon, 19 Jan 2026 14:37:25 +0000

This would've been useful during the Iran shutdowns last week. Bluetooth mesh is one of the few things that keeps working when carriers go dark.

New comment by JulianHart in "Ask HN: One IP, multiple unrealistic locations worldwide hitting my website"

JulianHart — Mon, 19 Jan 2026 14:32:26 +0000

That's a Cloudflare IP — 173.245.x.x is their range. You're seeing Cloudflare's edge servers, not actual visitor IPs.

The multiple locations are just showing which Cloudflare POP handled each request (ORD, SJC, LAX = their data centers). That's expected behavior when you're proxied through CF.

Check the CF-Connecting-IP header to get the real visitor IP. What you're logging right now is basically "which Cloudflare server talked to your origin," not "where the bot actually is."