ISP Alliance a.s.

Data as of 2026-07-26
BGP inherited
Cluster stats
Netblocks111 · 54,564 IPv4 addresses
IPv6 34 prefixes (largest 2a02:17a0::/29)
Registered in Czechia (83) · Israel (4) · Ukraine (4) · MD (2) · Russia (1) · SY (1)
Cluster ID213202482
RegistryBGP
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 41 shared RIR contact/maintainer handles
Registry names 11 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

6 weekly snapshots · JSON
137 +18 netblocks since 2026-07-05
2026-07-05 peak 159 2026-07-26

IP Ranges (111)

showing 50 of 111 — see all — ⬇ export CSV
CIDR Org name Registry Status Confidence
5.39.200.0/23 ISP Alliance a.s. BGP ANNOUNCED ● high
5.183.12.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
46.29.224.0/21 ISP Alliance a.s. BGP ANNOUNCED ● high
46.255.8.0/21 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.194.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.210.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.216.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.223.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.240.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
77.104.245.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
78.111.112.0/20 ISP Alliance a.s. BGP ANNOUNCED ● high
91.192.32.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
91.210.16.109/32 ISP Alliance PEERINGDB ASSIGNED ● high
91.210.16.143/32 ISP Alliance PEERINGDB ASSIGNED ● high
93.91.144.0/20 ISP Alliance a.s. BGP ANNOUNCED ● high
93.91.152.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
93.91.154.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
94.138.116.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
94.138.120.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
94.140.25.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
109.235.0.0/21 ISP Alliance a.s. BGP ANNOUNCED ● high
148.59.93.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
185.0.20.22/32 ISP Alliance PEERINGDB ASSIGNED ● high
185.0.20.23/32 ISP Alliance PEERINGDB ASSIGNED ● high
185.1.51.61/32 ISP "3NET" PEERINGDB ASSIGNED ● high
185.1.63.114/32 ISP "3NET" PEERINGDB ASSIGNED ● high
185.1.146.9/32 ISP "3NET" PEERINGDB ASSIGNED ● high
185.15.108.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.40.80.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.52.172.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
185.52.172.0/23 ISP Alliance a.s. BGP ANNOUNCED ● high
185.73.100.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.73.104.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.73.108.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.74.61.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
185.94.4.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.138.68.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.151.171.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
185.155.32.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
185.167.184.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
193.25.181.215/32 ISP "3NET" PEERINGDB ASSIGNED ● high
193.107.160.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
193.138.152.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
195.26.25.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
195.138.109.0/24 isp wifi RIPE ASSIGNED PA ● high
195.138.113.0/24 isp wifi RIPE ASSIGNED PA ● high
213.108.162.0/23 ISP Alliance a.s. RIPE ASSIGNED PI ● high
213.109.172.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high
213.109.172.0/22 ISP Alliance a.s. BGP ANNOUNCED ● high
213.109.173.0/24 ISP Alliance a.s. BGP ANNOUNCED ● high

IPv6 ranges (34)

showing the 15 largest allocations
CIDR
2a02:17a0::/29
2a03:2a80::/29
2a03:4260::/29
2a03:d840::/29
2a04:7bc0::/29
2a04:c740::/29
2a04:f940::/29
2a06:400::/29
2a06:bac0::/29
2a07:9100::/29
2a07:bc0::/29
2a09:fc00::/29
2a0a:10c0::/29
2a0a:ddc0::/29
2a0d:3140::/29

Customer-delegated space

how is this classified?
Unclassified 122 (109.9%)
Operator infrastructure (named) 13 (11.7%)
Customer access pools 2 (1.8%)

Network trust

what's this?
RPKI hygiene: C how networks compare →
79.6% of checked blocks have valid RPKI ROA coverage (109 of 137)
Possible discrepancies (19)

These blocks are registered to ISP Alliance a.s. but cryptographically authorized for a different, unrelated network (5 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

2a04:c740::/29 /29 authorized for AS198668 — Tlapnet s.r.o.
2a04:f940::/29 /29 authorized for AS204666 — Jiri Tlapak
2a0d:3140::/29 /29 authorized for AS198668 — Tlapnet s.r.o.
2a10:8140::/29 /29 authorized for AS207886 — ECOMP spol s r.o.
2a0f:9300::/29 /29 authorized for AS198668 — Tlapnet s.r.o.
37.221.240.0/20 /20 authorized for AS198668 — Tlapnet s.r.o.
185.19.0.0/22 /22 authorized for AS198668 — Tlapnet s.r.o.
85.255.88.0/22 /22 authorized for AS204666 — Jiri Tlapak
45.153.192.0/22 /22 authorized for AS198668 — Tlapnet s.r.o.
185.97.24.0/22 /22 authorized for AS198668 — Tlapnet s.r.o.
185.74.60.0/23 /23 authorized for AS198668 — Tlapnet s.r.o.
185.116.51.0/24 /24 authorized for AS204064 — CEZNET s.r.o.
193.104.67.0/24 /24 authorized for AS207886 — ECOMP spol s r.o.
193.104.41.0/24 /24 authorized for AS207886 — ECOMP spol s r.o.
193.104.12.0/24 /24 authorized for AS207886 — ECOMP spol s r.o.
+4 more — see the REST API

NIC Handles

AC32880-RIPE AC38633-RIPE AS197393 AS201464 AS201476 AS202131 AS202774 AS210712 AS47232 AS47232 AS52084 AS56522 +29 more