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gap-system.org

.org crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 5036 ms crawled 2026-05-19

DE · 131.246.120.130 · AS199578 Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Start | GAP
Description
GAP system for computational discrete algebra, especially computational group theory
Language
en-US
Generator
Jekyll v4.4.1
Canonical
https://www.gap-system.org/

Open Graph

url
https://www.gap-system.org/
title
Start
locale
en_US
site name
GAP

Technology

Server
nginx

Social

Registration

Registrar
Key-Systems GmbH
Created
2000-07-28
Expires
2026-07-28 69 days left
Updated
2025-11-25
Name servers
  • ns1.rptu.de
  • ns2.rptu.de

DNS records live

NS
  • ns1.rptu.de
  • ns2.rptu.de
MX
  • 10 mailgate1.uni-kl.de
  • 5 mailgate2.uni-kl.de

Email authentication weak

SPF
v=spf1 redirect=_spf.uni-kl.de
no all qualifier
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R12
from 2026-04-05 to 2026-07-04
Expires in 45 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 65/100 Checked live page: https://www.gap-system.org/

present
  • strict-transport-security
  • content-security-policy
findings
  • short HSTS max-age
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
content-security-policy
upgrade-insecure-requests;
strict-transport-security
max-age=86400;

Links to (9)

Linked from (2)