AS214169 CLOUDFIRESRL Cloudfire s.r.l.

IPv6 prefix announced, but nothing inside is responding yet. AS214169 announces 1 IPv6 prefix(es) to the global routing table - that’s the part that BGP and our route-server scrape confirm. But our active discovery (curated hostnames, holder-derived domains, authoritative DNS NS/SOA/MX, certificate-transparency hostnames, RIPE Atlas, RDAP, IPv6 Hitlist) found no ICMPv6-responsive host inside the prefix on either vantage, and a yarrp pass against random addresses inside the prefix produced zero in-prefix hops (no router on the path through the AS replied with Time-Exceeded for any random target). That combination usually means the announcement is configured but the addresses inside aren’t in active use yet. The BGP route is there; the operational deployment is still ahead.

AS overview

Test target: 2a0b:91c0::1 · (no live host found) · address space: PA · prefixes announced: 1

prefix(es): 2a0b:91c0::/29

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a0b:91c0::/29`	✓ valid	matched VRP (correct origin, length within maxLength)	AS203489 /29 maxLen 29 (ripe); AS214169 /29 maxLen 29 (ripe)

Random-IP probe (yarrp) into the AS' prefixes

We probed 15 arbitrary IPv6 address(es) inside AS214169's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2a03:b020:1:21::b at hop 24 - that router answers ICMPv6 Echo. This is not in AS214169's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 active test inconclusive: no Echo Reply to 1300-byte probe.
method: ICMPv6 Echo + forged PTB, tested 2026-05-25T12:35:41Z

Failure detail — what to grep in your logs

vantage	our source	your target	method	result	tested (UTC)
go6lab	`2a00:8642:42::75`	`2a0b:91c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:35:41Z
karsolink	`2a12:d8c0:105a:9001::a154`	`2a0b:91c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:46:48Z
odin	`2607:fae0:a000::42`	`2a0b:91c0::1`	`icmp6-echo`	no_echo	2026-05-25T12:35:14Z

Attempt log (go6lab):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (karsolink):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

Attempt log (odin):

icmp6-echo → no_echo: no Echo Reply to 1300-byte probe
dns-tcp → no_tcp: connect failed: [Errno 13] Permission denied
tls → no_tcp: TLS connect failed
http → no_tcp: tcp/80 not open

To match the corresponding ICMPv6 packet on your side (host firewall, AS edge, or transit tap), look for our PTBs around the timestamps above:

sudo tcpdump -i any -n -e 'icmp6 and ip6[40] = 2 and (src host 2607:fae0:a000::42 or src host 2a00:8642:42::75 or src host 2a12:d8c0:105a:9001::a154)'

If you see our PTBs arriving but the destination's TCP/Echo flow does not shrink, the drop is in the destination kernel (cause 3 below). If you don't see them at all, drop is upstream of you (cause 2). If you only see them from one of our two source IPs, the drop is path-asymmetric — one transit on the asymmetric route is filtering, the other is not.

From NL host (go6lab) transit only unreachable

filter likely at: past AS41327 (FIBERTELECOM-AS) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::3	1.5ms	0%	AS203993	STEFFANN-DC-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	speed-ix.fibertelecom.it 2001:7f8:b7::a504:1327:1	3.9ms	0%	-	NA
4	2a03:b020::220	20.0ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020:1:21::b	20.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	2a03:b020:1:21::b	20.9ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT

tracepath -6

 1?: [LOCALHOST]                        0.049ms pmtu 1500
 1:  2a00:8642:42::3                                       1.842ms 
 1:  2a00:8642:42::3                                       1.958ms 
 2:  gw.friends.steffann.nl                                3.080ms 
 3:  speed-ix.fibertelecom.it                              3.894ms 
 4:  2a03:b020::220                                       19.983ms 
 5:  2a03:b020:1:21::b                                    20.536ms 
 6:  2a03:b020:1:21::b                                    21.335ms !A
     Resume: pmtu 1500

From ITA host (Karsolink) transit only unreachable

filter likely at: past AS41327 (FIBERTELECOM-AS) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a12:d8c0:109f:121::a1	0.4ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:6::1	10.0ms	0%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	2a03:b020:1:51::a	10.0ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
5	2a03:b020::220	10.5ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
6	2a03:b020:1:21::b	11.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
7	2a03:b020:1:21::b	11.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT

tracepath -6

 1?: [LOCALHOST]                        0.029ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.706ms 
 1:  karsolink-01.net.karsolink.com                        0.515ms 
 2:  2a12:d8c0:109f:121::a1                                0.938ms 
 3:  2a12:d8c0:101f:6::1                                  10.396ms 
 4:  2a03:b020:1:51::a                                    10.836ms 
 5:  2a03:b020::220                                       11.023ms 
 6:  2a03:b020:1:21::b                                    11.815ms 
 7:  2a03:b020:1:21::b                                    12.260ms !A
     Resume: pmtu 1500

From SLO host (6connect) transit only unreachable

filter likely at: past AS41327 (FIBERTELECOM-AS) · min PMTU on path: 1500

0/4

Echo small (56B) -

0/4

Echo 1500B (DF) -

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.3ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	0%*	-
3	2a03:a100:0:201:1::1	0.7ms	70%	AS56635	XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI
4	e0-1.core1.lju1.he.net 2001:470:1:5be::1	2.1ms	50%	AS6939	HURRICANE - Hurricane Electric LLC, US
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	6.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	e0-35.core2.muc1.he.net 2001:470:0:41d::2	12.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	ipv6.de-cix.muc.as41327.fibertelecom.com 2001:7f8:44::a16f:0:1	23.1ms	0%	-	NA
8	2a03:b020::220	26.2ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
9	2a03:b020:1:21::b	27.1ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT
10	2a03:b020:1:21::b	27.9ms	0%	AS41327	FIBERTELECOM-AS - Fiber Telecom S.p.A., IT

Rate-limited ICMPv6: hop 3, hop 4 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1500
 1:  fw1-lju.6connect.com                                  1.137ms 
 1:  fw1-lju.6connect.com                                  0.594ms 
 2:  ccr-to-fw-ccr1-gw-lju.6connect.com                    2.478ms 
 3:  no reply
 4:  no reply
 5:  100ge0-0-0-5.core1.vie1.he.net                        8.075ms 
 6:  e0-35.core2.muc1.he.net                              12.045ms 
 7:  ipv6.de-cix.muc.as41327.fibertelecom.com             17.786ms asymm 10 
 8:  2a03:b020::220                                       26.602ms asymm 11 
 9:  2a03:b020:1:21::b                                    27.313ms asymm 13 
10:  2a03:b020:1:21::b                                    27.977ms !A
     Resume: pmtu 1500