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Server Side Request Forgery · passage 6 of 53

Bypass Localhost with CIDR

1 code block · Server Side Request Forgery/README.md

For testing systems you own or are authorised to test, and for defending them. Nothing here is run by this page.

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The IP range `127.0.0.0/8` in IPv4 is reserved for loopback addresses.

http://127.127.127.127
http://127.0.1.3
http://127.0.0.0

If you try to use any address in this range (127.0.0.2, 127.1.1.1, etc.) in a network, it will still resolve to the local machine

Source: Server Side Request Forgery/README.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.

Every one of the 53 is a mark on the map. Named now: 1 to 26, reading order first.

  1. Server-Side Request Forgery§ 1text · README.md
  2. Methodology§ 22 code blocks · README.md
  3. Default Targets§ 3text · README.md
  4. Bypass Localhost with IPv6 Notation§ 4text · README.md
  5. Bypass Localhost with a Domain Redirect§ 51 code block · README.md
  6. Bypass Localhost with CIDR§ 61 code block · README.md
  7. Bypass Using Rare Address§ 71 code block · README.md
  8. Bypass Using an Encoded IP Address§ 8text · README.md
  9. Bypass Using Different Encoding§ 9text · README.md
  10. Bypassing via ipv6 hostname§ 10text · README.md
  11. Bypassing Using a Redirect§ 11text · README.md
  12. Bypass Using DNS Rebinding§ 122 code blocks · README.md
  13. Bypass Abusing URL Parsing Discrepancy§ 131 code block · README.md
  14. Bypass PHP filtervar() Function§ 141 code block · README.md
  15. Bypass Using TLD localhost§ 151 code block · README.md
  16. Bypass Using JAR Scheme§ 161 code block · README.md
  17. File§ 171 code block · README.md
  18. HTTP§ 181 code block · README.md
  19. Dict§ 191 code block · README.md
  20. SFTP§ 201 code block · README.md
  21. TFTP§ 211 code block · README.md
  22. LDAP§ 221 code block · README.md
  23. Netdoc§ 231 code block · README.md
  24. Gopher§ 242 code blocks · README.md
  25. Blind Exploitation§ 25text · README.md
  26. Upgrade to XSS§ 261 code block · README.md

Zoom in on the map and the dots under the middle of it are named where they are.

Data as of 2026-11-15. CVE List through 2026-11-15 · EPSS of 2026-11-14 · CISA KEV checked 2026-11-15. Source: PayloadsAllTheThings by Swissky and contributors, MIT License. For authorised testing only.

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