htdp.org

.org crawl

First seen 2026-04-27 · Last seen 2026-05-16 · ok HTTP/1.1 200 951 ms crawled 2026-05-02

US · 185.199.110.153 · AS54113 Fastly, Inc.

Reputation 100/100

Classifying

HTML metadata

Title: How to Design Programs

Technology

CDN: Fastly
Server: GitHub.com

Registration

Registrar

Squarespace Domains II LLC

Created

2001-06-29

Expires

2026-06-29 41 days left

Updated

2025-07-17

Name servers

ns-cloud-b1.googledomains.com
ns-cloud-b4.googledomains.com
ns-cloud-b2.googledomains.com
ns-cloud-b3.googledomains.com

DNS records live

NS

ns-cloud-b1.googledomains.com
ns-cloud-b2.googledomains.com
ns-cloud-b3.googledomains.com
ns-cloud-b4.googledomains.com

MX

1 aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com

TXT

v=spf1 include:_spf.google.com include:mailgun.org ~all

Certificate (current)

R12

from 2026-04-25 to 2026-07-24

Expires in 66 days

Full certificate history on crt.sh ↗

Linked from (1)

r7rs.org×2