Week 2 Gate Tool · Hard Mode
Subnetting Trainer
Exam-difficulty drills using the seven attributes from SubnetIPv4.com (Network ID, Broadcast, First/Last Host, Next Network, block size, masks). Watch the JITL Subnetting Mastery playlist first — video credit in the sidebar. The Scenarios mode includes 3 categories of original challenge questions (Original Scenario Bank).
Live Stats
Session
0%
Streak
0
Best
0
Timed
0
CIDR timed
0/10
Correct
0/0
Subnet Cheat Sheet
Double-click chart to open full reference
| /25 | /26 | /27 | /28 | /29 | /30 | /31 | /32 | = 4th octet |
| 128 | 192 | 224 | 240 | 248 | 252 | 254 | 255 | = mask |
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 | = increment |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | = bits |
JITL — Subnetting Mastery
Video credit: JITL Subnetting Mastery playlist. Watch before drilling — same seven attributes as SubnetIPv4.com.
Playlist chapters
- • Part 1 — Seven subnetting attributes
- • Part 2 — Draw the cheat sheet
- • Part 3 — Solve any problem in 60 seconds
- • Part 4 — Practice problems
- • Part 5 — Speed tricks
- • Part 6 — /17–/24 range
- • Part 7 — /1–/16 range
- • Appendix — FLSM & VLSM
Practice format credit
Question types inspired by the SubnetIPv4.com practice format (Network ID, Broadcast, First/Last Host, Next Network, block size, and mask conversions). Problems are generated locally — not scraped from the site.
https://subnetipv4.com/