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~/dnsniffer/issuers/isimtescil-bilisim-a-s·rank #53

▸ How many domains does Isimtescil Bilisim A.S secure?

3,872

active domains whose current TLS certificate was issued by Isimtescil Bilisim A.S, as of - 0.00% of all attributed domains.

# rank #53 of all CAs ▼ 8 in 30d# all records held: 4,787# subdomains: 335# intermediates: 1# Türkiye
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~/issuers/isimtescil-bilisim-a-s/history·active domains
3,872
domains secured by Isimtescil Bilisim A.S on 2026-10-15 · ▲ +1,441 (+59.28%) since 2025-06-30
2.0K3.1K4.1K5.2K6.3K2025-06-30: 2,431 active2025-07-31: 4,303 active2025-08-31: 4,362 active2025-09-30: 4,485 active2025-10-31: 4,485 active2025-11-30: 4,485 active2025-12-31: 5,050 active2026-01-31: 5,293 active2026-02-28: 5,293 active2026-03-31: 5,293 active2026-04-30: 5,798 active2026-05-31: 5,865 active2026-06-30: 5,865 active2026-07-31: 5,865 active2026-08-31: 5,865 active2026-09-01: 5,862 active2026-09-02: 5,852 active2026-09-03: 5,797 active2026-09-04: 5,519 active2026-09-05: 5,211 active2026-09-06: 5,185 active2026-09-07: 5,178 active2026-09-08: 5,164 active2026-09-09: 5,156 active2026-09-10: 5,145 active2026-09-11: 5,140 active2026-09-12: 5,123 active2026-09-13: 5,117 active2026-09-14: 5,108 active2026-09-15: 5,101 active2026-09-16: 5,091 active2026-09-17: 5,084 active2026-09-18: 4,945 active2026-09-19: 4,760 active2026-09-20: 4,746 active2026-09-21: 4,722 active2026-09-22: 4,697 active2026-09-23: 4,665 active2026-09-24: 4,864 active2026-09-25: 4,843 active2026-09-26: 4,818 active2026-09-27: 4,802 active2026-09-28: 4,559 active2026-09-29: 4,332 active2026-09-30: 4,291 active2026-10-01: 4,255 active2026-10-02: 4,222 active2026-10-03: 4,200 active2026-10-04: 4,186 active2026-10-05: 4,152 active2026-10-06: 4,119 active2026-10-07: 4,093 active2026-10-08: 4,071 active2026-10-09: 4,044 active2026-10-10: 4,017 active2026-10-11: 4,006 active2026-10-12: 3,975 active2026-10-13: 3,941 active2026-10-14: 3,909 active2026-10-15: 3,872 active2025-06-302026-10-15

# y-axis starts at 2.0K, not zero - domain counts move by fractions of a percent a day. Dashed segments are estimated: reconstructed from certificate first-seen dates before daily snapshots began, not measured on the day.

# change over time
30 days
▼ -24.09%
-1,229 domains
90 days
▼ -33.98%
-1,993 domains
1 year
▼ -13.67%
-613 domains
# intermediate CAs
Intermediate certificate authorities operating under Isimtescil Bilisim A.S, with the number of active domains each currently secures.
intermediatecountrydomains
TrustSafe TLS RSA SubCA R1Türkiye3,872
# faq
? How many domains does Isimtescil Bilisim A.S secure?
Isimtescil Bilisim A.S is the certificate authority for 3,872 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
? Is Isimtescil Bilisim A.S gaining or losing market share?
The number of domains secured by Isimtescil Bilisim A.S has shrunk by 13.67% over the last year (-613 domains).
? Which intermediate CAs does Isimtescil Bilisim A.S sign from?
We have seen 1 intermediates under Isimtescil Bilisim A.S, the busiest being “TrustSafe TLS RSA SubCA R1” with 3,872 domains. The full list, with per-intermediate counts, is on this page.
? Where does this number come from?
DNSniffer ingests Certificate Transparency logs continuously and records the issuer of the most recent certificate seen for each domain, then snapshots the per-issuer count once a day. It measures how much of the live web a CA currently secures, not how many certificates it has issued over its lifetime.
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