Field notes

The helpers.work blog

Practical guides on DNS, networking and security — written for people who read RFCs for fun.

DNS propagation, explained without the hand-waving

Why changes take time, how TTLs really work, and how to verify a record has gone live everywhere.

The three records that decide whether your email lands in the inbox or the spam folder.

Routing, ownership and why /asn pages are an SEO goldmine for tool sites.

Root, intermediate, leaf — what each link does and how to debug a broken chain.