SYN HOLDINGS LTD

SYN LTD
Data as of 2026-09-06
GLEIF verified
LEI
254900KQMTJQ0XX45X86
Registered name
SYN HOLDINGS LTD
Jurisdiction
GB
Ultimate parent
No parent on file in GLEIF
This organisation
Netblocks109 · 52,328 IPv4 addresses
IPv6 25 prefixes (largest 2a02:2ca0::/29)
Registered in United Kingdom (81) · IS (2) · BZ (1) · Germany (1) · Belgium (1) · Greece (1)
Also registered under this name 216 netblocks across 21 separate records
Record ID236106249
RegistryBGP
Owner jurisdictionGB
Customerssee who runs inside this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 254900KQMTJQ0XX45X86
Shared handles clustered on 18 shared RIR contact/maintainer handles
Registry names 11 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

IP Ranges (109)

⬇ export CSV
CIDR Org name Registry Status Confidence
43.239.88.0/22 SYN LTD BGP ANNOUNCED ● high
45.43.64.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.65.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.67.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.68.0/22 SYN LTD BGP ANNOUNCED ● high
45.43.80.0/22 SYN LTD BGP ANNOUNCED ● high
45.43.84.0/23 SYN LTD BGP ANNOUNCED ● high
45.43.87.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.93.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.94.0/24 SYN LTD BGP ANNOUNCED ● high
45.43.95.0/24 SYN LTD BGP ANNOUNCED ● high
87.239.253.0/24 SYN LTD BGP ANNOUNCED ● high
89.33.6.0/24 SYN LTD BGP ANNOUNCED ● high
89.33.7.0/24 SYN LTD BGP ANNOUNCED ● high
91.210.64.0/22 SYN LTD BGP ANNOUNCED ● high
91.226.97.0/24 SYN LTD BGP ANNOUNCED ● high
94.177.5.0/24 SYN LTD BGP ANNOUNCED ● high
103.206.232.0/22 SYN LTD BGP ANNOUNCED ● high
107.161.163.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.164.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.165.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.166.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.167.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.172.0/24 SYN LTD BGP ANNOUNCED ● high
107.161.173.0/24 SYN LTD BGP ANNOUNCED ● high
107.181.128.0/22 SYN LTD BGP ANNOUNCED ● high
107.181.132.0/23 SYN LTD BGP ANNOUNCED ● high
107.181.140.0/22 SYN LTD BGP ANNOUNCED ● high
107.181.148.0/23 SYN LTD BGP ANNOUNCED ● high
107.181.150.0/24 SYN LTD BGP ANNOUNCED ● high
107.181.152.0/24 SYN LTD BGP ANNOUNCED ● high
107.181.153.0/24 SYN LTD BGP ANNOUNCED ● high
107.181.154.0/24 SYN LTD BGP ANNOUNCED ● high
107.181.156.0/22 SYN LTD BGP ANNOUNCED ● high
113.20.157.0/24 SYN LTD BGP ANNOUNCED ● high
113.20.158.0/24 SYN LTD BGP ANNOUNCED ● high
155.254.32.0/24 SYN LTD BGP ANNOUNCED ● high
155.254.33.0/24 SYN LTD BGP ANNOUNCED ● high
155.254.34.0/24 SYN LTD BGP ANNOUNCED ● high
155.254.36.0/22 SYN LTD BGP ANNOUNCED ● high
155.254.40.0/22 SYN LTD BGP ANNOUNCED ● high
155.254.44.0/22 SYN LTD BGP ANNOUNCED ● high
155.254.48.0/23 SYN LTD BGP ANNOUNCED ● high
155.254.50.0/23 SYN LTD BGP ANNOUNCED ● high
155.254.52.0/22 SYN LTD BGP ANNOUNCED ● high
155.254.56.0/22 SYN LTD BGP ANNOUNCED ● high
155.254.61.0/24 SYN LTD BGP ANNOUNCED ● high
155.254.63.0/24 SYN LTD BGP ANNOUNCED ● high
162.220.246.0/23 SYN LTD BGP ANNOUNCED ● high
185.135.212.0/22 SYN LTD BGP ANNOUNCED ● high
198.105.96.0/22 SYN LTD BGP ANNOUNCED ● high
198.105.100.0/22 SYN LTD BGP ANNOUNCED ● high
198.105.104.0/22 SYN LTD BGP ANNOUNCED ● high
198.105.108.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.109.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.110.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.111.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.119.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.121.0/24 SYN LTD BGP ANNOUNCED ● high
198.105.122.0/24 SYN LTD BGP ANNOUNCED ● high
2a05:9f40:1f::/48 SYN LTD BGP ANNOUNCED ● high
2a05:9f44:2a05::/48 SYN LTD BGP ANNOUNCED ● high
2a05:9f46::/32 SYN LTD BGP ANNOUNCED ● high
2a05:9f47::/32 SYN LTD BGP ANNOUNCED ● high
2a07:9942:39d6::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9944:40::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9945:45::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9946:17c::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9946:23b::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9946:826::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9946:db0::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9946:fd5::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9947:1c3::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9947:495::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9947:8cc::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9947:b6f::/48 SYN LTD BGP ANNOUNCED ● high
2a07:9947:fef::/48 SYN LTD BGP ANNOUNCED ● high
45.43.64.0/19 SYN LTD RIPE ALLOCATED PA ● low
80.175.191.192/28 SYN-TEC RIPE ASSIGNED PA ● low
81.3.97.208/28 SYN-TEC RIPE ASSIGNED PA ● low
85.118.214.0/27 syn_azu RIPE ASSIGNED PA ● low
87.239.249.0 – 87.239.253.255 SYN LTD RIPE ALLOCATED PA ● low
89.33.6.0/23 SYN LTD RIPE ALLOCATED PA ● low
94.177.4.0/23 SYN LTD RIPE ALLOCATED PA ● low
103.35.56.0/22 SYN LTD RIPE ALLOCATED PA ● low
107.161.160.0/20 SYN LTD RIPE ALLOCATED PA ● low
107.181.128.0/19 SYN LTD RIPE ALLOCATED PA ● low
107.181.135.0/24 SYN-TX RIPE ASSIGNED PA ● low
113.20.156.0/22 SYN LTD RIPE ALLOCATED PA ● low
155.254.32.0/19 SYN LTD RIPE ALLOCATED PA ● low
162.217.248.0/22 SYN LTD RIPE ALLOCATED PA ● low
162.217.251.0/24 SYN-NYC-BGP RIPE ASSIGNED PA ● low
162.220.240.0/21 SYN LTD RIPE ALLOCATED PA ● low
185.1.200.0/24 Syn hf RIPE ASSIGNED PI ● low
185.53.128.0/22 SYN LTD RIPE ALLOCATED PA ● low
185.83.216.0/22 SYN LTD RIPE ALLOCATED PA ● low
185.179.108.0/22 Syn hf RIPE ALLOCATED PA ● low
195.170.7.0/24 SYN RIPE ASSIGNED PA ● low
198.105.96.0/19 SYN LTD RIPE ALLOCATED PA ● low
212.144.96.224/27 SYN-NET RIPE ASSIGNED PA ● low
217.141.44.112/29 SYN-SPA RIPE ASSIGNED PA ● low
2001:7f8:10c::/48 Syn hf RIPE ASSIGNED PI ● low
2a00:4d60::/32 Syn hf RIPE ALLOCATED-BY-RIR ● low
2a00:71e0::/32 Syn hf RIPE ALLOCATED-BY-RIR ● low
2a02:48::/29 Syn hf RIPE ALLOCATED-BY-RIR ● low
2a02:2ca0::/29 SYN LTD RIPE ALLOCATED-BY-RIR ● low
2a05:9f40::/29 SYN LTD RIPE ALLOCATED-BY-RIR ● low
2a07:9940::/29 SYN LTD RIPE ALLOCATED-BY-RIR ● low
2a07:9940:3333::/48 SYN-DAL RIPE ASSIGNED ● low

IPv6 ranges (25)

showing the 15 largest allocations
CIDR
2a02:2ca0::/29
2a02:48::/29
2a05:9f40::/29
2a07:9940::/29
2a00:4d60::/32
2a00:71e0::/32
2a05:9f46::/32
2a05:9f47::/32
2001:7f8:10c::/48
2a05:9f40:1f::/48
2a05:9f44:2a05::/48
2a07:9940:3333::/48
2a07:9942:39d6::/48
2a07:9944:40::/48
2a07:9945:45::/48

Footprint over time

11 weekly snapshots · JSON
113 -32 netblocks since 2026-07-05
2026-07-05 peak 145 2026-09-06

Network trust

what's this?
RPKI hygiene: C how networks compare →
79.6% of checked blocks have valid RPKI ROA coverage (90 of 113)
Wholesale/transit re-announcements (68)

These blocks are registered to SYN LTD but cryptographically authorized across 6 different networks — typical for a large wholesale or transit carrier whose address space is substantially re-announced by downstream customers under their own ASNs, not individually noteworthy.

2a02:2ca0::/29 /29 authorized for AS43350 — NForce Entertainment B.V.
2a05:9f46::/32 /32 authorized for AS42831 — UK Dedicated Servers Limited
2a05:9f47::/32 /32 authorized for AS42831 — UK Dedicated Servers Limited
2a07:9940:3333::/48 /48 authorized for AS40676 — Psychz Networks
2a05:9f40:1f::/48 /48 authorized for AS42831 — UK Dedicated Servers Limited
2a05:9f44:2a05::/48 /48 authorized for AS42831 — UK Dedicated Servers Limited
2a07:9942:39d6::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9944:40::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9945:45::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9946:17c::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9946:23b::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9946:826::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9946:db0::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9946:fd5::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
2a07:9947:1c3::/48 /48 authorized for AS23470 — ReliableSite.Net LLC
+53 more — see the REST API

NIC Handles

ARCOR-MNT AS50077 AS58305 AS64080 DUMY-RIPE DUMY-RIPE INTERB-MNT MNT-MCM MNT-SYN MNT-SYN NEWNET-MNT ORG-Ih2-RIPE +6 more