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yuanke215

Maintainer of IPCalcPlus, a collection of free browser-based network and IT tools.

Joined Joined on  github website
I Wasted Half My /24s Before I Learned VLSM
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I Wasted Half My /24s Before I Learned VLSM

#networking #devops #sysadmin #cloud
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3 min read
An IPv4 Admin's First Hour with IPv6 Subnets
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An IPv4 Admin's First Hour with IPv6 Subnets

#networking #ipv6 #sysadmin #devops
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4 min read
The Hash You Pick Matters: MD5, SHA-1, SHA-256, and What Each Is Still Good For
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The Hash You Pick Matters: MD5, SHA-1, SHA-256, and What Each Is Still Good For

#security #devops #webdev #python
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4 min read
Stop Storing IP Addresses as Strings: The Integer Trick That Makes Your Queries 10x Faster
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Stop Storing IP Addresses as Strings: The Integer Trick That Makes Your Queries 10x Faster

#database #devops #performance #python
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4 min read
Your Firewall Speaks CIDR, Your Vendor Speaks IP Ranges
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Your Firewall Speaks CIDR, Your Vendor Speaks IP Ranges

#networking #cloud #security #python
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4 min read
The Subnet Overlap Nobody Saw Coming (and the 30-Second Check That Catches It)
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The Subnet Overlap Nobody Saw Coming (and the 30-Second Check That Catches It)

#networking #devops #sysadmin #cloud
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4 min read
401 vs 403 vs 404: The Status Code Mistakes That Break APIs
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401 vs 403 vs 404: The Status Code Mistakes That Break APIs

#api #backend #webdev
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5 min read
Five Cron Fields, One Trap: The Scheduling Bug Nobody Expects
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Five Cron Fields, One Trap: The Scheduling Bug Nobody Expects

#devops #linux #backend
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4 min read
Stop Guessing Subnet Sizes: A Practical Mental Model for IPv4 Subnetting
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Stop Guessing Subnet Sizes: A Practical Mental Model for IPv4 Subnetting

#sysadmin #networking #tutorial
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4 min read
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